Why do we use a transformer on some heating element projects when the wattage is the same on both sides of...
$begingroup$
On some projects involving heating elements there's a transformer being used.
and the explanation given is "we are using a transformer because need more current"
but since the watts on both sides of the Transformer are supposed to be identical,
wouldn't the heating element dissipate the same energy with and without the Transformer ?
power transformer heat
asked 1 hour ago
soundslikefizikssoundslikefiziks
483316
$endgroup$
|
show 4 more comments
$begingroup$
On some projects involving heating elements there's a transformer being used.
and the explanation given is "we are using a transformer because need more current"
but since the watts on both sides of the Transformer are supposed to be identical,
wouldn't the heating element dissipate the same energy with and without the Transformer ?
power transformer heat
asked 1 hour ago
soundslikefizikssoundslikefiziks
483316
$endgroup$
1
$begingroup$
Why are you talking about "wattage" when citing some current reasoning?
$endgroup$
– Eugene Sh.
1 hour ago
$begingroup$
@EugeneSh. because i don't understand the current reasoning, i thought power is the same according to P=IV
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
The power is the same, but the voltage and the current can vary. If your heater is requiring more (or less) voltage than provided, you need a transformer.
$endgroup$
– Eugene Sh.
1 hour ago
1
$begingroup$
The resistor will dissipate $V^2/R$. Where $V$ will depend on the transformer.
$endgroup$
– Eugene Sh.
1 hour ago
1
$begingroup$
Same as what? If the voltage on your supply is much higher than the $V$ above, then if you connect resistor directly to it the power will be much higher as well. The power (on both sides) is determined by the load, not by the transformer.
$endgroup$
– Eugene Sh.
1 hour ago
|
show 4 more comments
$begingroup$
On some projects involving heating elements there's a transformer being used.
and the explanation given is "we are using a transformer because need more current"
but since the watts on both sides of the Transformer are supposed to be identical,
wouldn't the heating element dissipate the same energy with and without the Transformer ?
power transformer heat
asked 1 hour ago
soundslikefizikssoundslikefiziks
483316
$endgroup$
On some projects involving heating elements there's a transformer being used.
and the explanation given is "we are using a transformer because need more current"
but since the watts on both sides of the Transformer are supposed to be identical,
wouldn't the heating element dissipate the same energy with and without the Transformer ?
power transformer heat
power transformer heat
asked 1 hour ago
soundslikefizikssoundslikefiziks
483316
asked 1 hour ago
soundslikefizikssoundslikefiziks
483316
asked 1 hour ago
soundslikefizikssoundslikefiziks
483316
asked 1 hour ago
soundslikefizikssoundslikefiziks
483316
asked 1 hour ago
soundslikefizikssoundslikefiziks
483316
483316
1
$begingroup$
Why are you talking about "wattage" when citing some current reasoning?
$endgroup$
– Eugene Sh.
1 hour ago
$begingroup$
@EugeneSh. because i don't understand the current reasoning, i thought power is the same according to P=IV
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
The power is the same, but the voltage and the current can vary. If your heater is requiring more (or less) voltage than provided, you need a transformer.
$endgroup$
– Eugene Sh.
1 hour ago
1
$begingroup$
The resistor will dissipate $V^2/R$. Where $V$ will depend on the transformer.
$endgroup$
– Eugene Sh.
1 hour ago
1
$begingroup$
Same as what? If the voltage on your supply is much higher than the $V$ above, then if you connect resistor directly to it the power will be much higher as well. The power (on both sides) is determined by the load, not by the transformer.
$endgroup$
– Eugene Sh.
1 hour ago
|
show 4 more comments
1
$begingroup$
Why are you talking about "wattage" when citing some current reasoning?
$endgroup$
– Eugene Sh.
1 hour ago
$begingroup$
@EugeneSh. because i don't understand the current reasoning, i thought power is the same according to P=IV
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
The power is the same, but the voltage and the current can vary. If your heater is requiring more (or less) voltage than provided, you need a transformer.
$endgroup$
– Eugene Sh.
1 hour ago
1
$begingroup$
The resistor will dissipate $V^2/R$. Where $V$ will depend on the transformer.
$endgroup$
– Eugene Sh.
1 hour ago
1
$begingroup$
Same as what? If the voltage on your supply is much higher than the $V$ above, then if you connect resistor directly to it the power will be much higher as well. The power (on both sides) is determined by the load, not by the transformer.
$endgroup$
– Eugene Sh.
1 hour ago
1
1
$begingroup$
Why are you talking about "wattage" when citing some current reasoning?
$endgroup$
– Eugene Sh.
1 hour ago
$begingroup$
Why are you talking about "wattage" when citing some current reasoning?
$endgroup$
– Eugene Sh.
1 hour ago
$begingroup$
@EugeneSh. because i don't understand the current reasoning, i thought power is the same according to P=IV
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
@EugeneSh. because i don't understand the current reasoning, i thought power is the same according to P=IV
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
The power is the same, but the voltage and the current can vary. If your heater is requiring more (or less) voltage than provided, you need a transformer.
$endgroup$
– Eugene Sh.
1 hour ago
$begingroup$
The power is the same, but the voltage and the current can vary. If your heater is requiring more (or less) voltage than provided, you need a transformer.
$endgroup$
– Eugene Sh.
1 hour ago
1
1
$begingroup$
The resistor will dissipate $V^2/R$. Where $V$ will depend on the transformer.
$endgroup$
– Eugene Sh.
1 hour ago
$begingroup$
The resistor will dissipate $V^2/R$. Where $V$ will depend on the transformer.
$endgroup$
– Eugene Sh.
1 hour ago
1
1
$begingroup$
Same as what? If the voltage on your supply is much higher than the $V$ above, then if you connect resistor directly to it the power will be much higher as well. The power (on both sides) is determined by the load, not by the transformer.
$endgroup$
– Eugene Sh.
1 hour ago
$begingroup$
Same as what? If the voltage on your supply is much higher than the $V$ above, then if you connect resistor directly to it the power will be much higher as well. The power (on both sides) is determined by the load, not by the transformer.
$endgroup$
– Eugene Sh.
1 hour ago
|
show 4 more comments
2 Answers
2
active
oldest
votes
$begingroup$
Power in a heater is given by the equation $ P = VI $ where P is power (watts), V the applied voltage (volts) and I the current (amps). You can see that there are multiple ways to achieve a given power - high voltage / low current - low voltage / high current.
For a transformer the relationship between input and output is given by $ P_{in} = P_{out} $ (ignoring the few percent losses in the transformer). From the previous formula we can write $ V_{in}I_{in} = V_{out}I_{out} $. This allows us to step the voltage up or down to meet the requirements of the load.
... but since the watts on both sides of the transformer are supposed to be identical, wouldn't the heating element dissipate the same energy with and without the transformer?
Yes, if the resistance of the wire is the same. A high voltage heater will use a very thin wire with high resistance. If this proves too fragile or too thin for the application then a thicker wire can be used but the current will have to increase to get the same current density in the wire. Since the wire is thicker it has a lower resistance so a lower voltage can be used too. An example is the butcher's bag sealing machine which uses an 'impulse' element nichrome (or similar) wire to seal the bag. Here a certain thickness of seal may be required and so a lower voltage, higher current is required. The transformer 'transforms' the voltage and current to match the heater and provides electrical isolation from the mains eliminating a shock hazard.
answered 1 hour ago
TransistorTransistor
81.5k778176
$endgroup$
$begingroup$
"and provides electrical isolation from the mains eliminating a shock hazard." so the benefit of connecting a transformer after a household socket is just so that the high current wont switch on the breaker ?
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
i mean, assuming we have a thicker cable like you say and we need to run more current through it, we can theoretically connect it to the 110v outlet without a breaker, and it could potentially provide much more current than it's stepped down voltage on the transformer. so "bypassing the breaker amp limit" is the only benefit i see now for using a transformer. (but i am sure my understanding still hasn't fully clicked in. so that can't be the only usage for a transformer)
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
Since the resistance is fixed, to set the power you need to vary the voltage and current. This is what the transformer is for.
$endgroup$
– evildemonic
55 mins ago
$begingroup$
@soundslikefiziks I think you've missed two points: 1) Stepping down the voltage makes it safer - if the voltage is less than 50V you are unlikely to be electrocuted if you touch the element. 2) For a given wattage, you can use high voltage and low current, or low voltage and high current. High voltage and low current means a high resistance - a long, thin resistance wire which may be fragile. Low voltage and high current implies a short, fat resistance wire, which is sturdier.
$endgroup$
– Simon B
39 mins ago
add a comment |
$begingroup$
If you have a 1000 Watt kettle designed for use in North America, where we have 120V power in the kitchen, then take it to Europe where they have 240V, the kettle will consume 4000 watts (resistance unchanged, but double voltage, power is voltage squared over resistance).
To use the kettle safely in Europe, you will need a step-down transformer to convert the 240V supply to the 120V that the kettle expects. With the step-down transformer the kettle will consume 1000 watts, and the transformer will draw 1000 watts from the 240V source.
answered 53 mins ago
Peter BennettPeter Bennett
37k12967
$endgroup$
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Power in a heater is given by the equation $ P = VI $ where P is power (watts), V the applied voltage (volts) and I the current (amps). You can see that there are multiple ways to achieve a given power - high voltage / low current - low voltage / high current.
For a transformer the relationship between input and output is given by $ P_{in} = P_{out} $ (ignoring the few percent losses in the transformer). From the previous formula we can write $ V_{in}I_{in} = V_{out}I_{out} $. This allows us to step the voltage up or down to meet the requirements of the load.
... but since the watts on both sides of the transformer are supposed to be identical, wouldn't the heating element dissipate the same energy with and without the transformer?
Yes, if the resistance of the wire is the same. A high voltage heater will use a very thin wire with high resistance. If this proves too fragile or too thin for the application then a thicker wire can be used but the current will have to increase to get the same current density in the wire. Since the wire is thicker it has a lower resistance so a lower voltage can be used too. An example is the butcher's bag sealing machine which uses an 'impulse' element nichrome (or similar) wire to seal the bag. Here a certain thickness of seal may be required and so a lower voltage, higher current is required. The transformer 'transforms' the voltage and current to match the heater and provides electrical isolation from the mains eliminating a shock hazard.
answered 1 hour ago
TransistorTransistor
81.5k778176
$endgroup$
$begingroup$
"and provides electrical isolation from the mains eliminating a shock hazard." so the benefit of connecting a transformer after a household socket is just so that the high current wont switch on the breaker ?
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
i mean, assuming we have a thicker cable like you say and we need to run more current through it, we can theoretically connect it to the 110v outlet without a breaker, and it could potentially provide much more current than it's stepped down voltage on the transformer. so "bypassing the breaker amp limit" is the only benefit i see now for using a transformer. (but i am sure my understanding still hasn't fully clicked in. so that can't be the only usage for a transformer)
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
Since the resistance is fixed, to set the power you need to vary the voltage and current. This is what the transformer is for.
$endgroup$
– evildemonic
55 mins ago
$begingroup$
@soundslikefiziks I think you've missed two points: 1) Stepping down the voltage makes it safer - if the voltage is less than 50V you are unlikely to be electrocuted if you touch the element. 2) For a given wattage, you can use high voltage and low current, or low voltage and high current. High voltage and low current means a high resistance - a long, thin resistance wire which may be fragile. Low voltage and high current implies a short, fat resistance wire, which is sturdier.
$endgroup$
– Simon B
39 mins ago
add a comment |
$begingroup$
Power in a heater is given by the equation $ P = VI $ where P is power (watts), V the applied voltage (volts) and I the current (amps). You can see that there are multiple ways to achieve a given power - high voltage / low current - low voltage / high current.
For a transformer the relationship between input and output is given by $ P_{in} = P_{out} $ (ignoring the few percent losses in the transformer). From the previous formula we can write $ V_{in}I_{in} = V_{out}I_{out} $. This allows us to step the voltage up or down to meet the requirements of the load.
... but since the watts on both sides of the transformer are supposed to be identical, wouldn't the heating element dissipate the same energy with and without the transformer?
Yes, if the resistance of the wire is the same. A high voltage heater will use a very thin wire with high resistance. If this proves too fragile or too thin for the application then a thicker wire can be used but the current will have to increase to get the same current density in the wire. Since the wire is thicker it has a lower resistance so a lower voltage can be used too. An example is the butcher's bag sealing machine which uses an 'impulse' element nichrome (or similar) wire to seal the bag. Here a certain thickness of seal may be required and so a lower voltage, higher current is required. The transformer 'transforms' the voltage and current to match the heater and provides electrical isolation from the mains eliminating a shock hazard.
answered 1 hour ago
TransistorTransistor
81.5k778176
$endgroup$
$begingroup$
"and provides electrical isolation from the mains eliminating a shock hazard." so the benefit of connecting a transformer after a household socket is just so that the high current wont switch on the breaker ?
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
i mean, assuming we have a thicker cable like you say and we need to run more current through it, we can theoretically connect it to the 110v outlet without a breaker, and it could potentially provide much more current than it's stepped down voltage on the transformer. so "bypassing the breaker amp limit" is the only benefit i see now for using a transformer. (but i am sure my understanding still hasn't fully clicked in. so that can't be the only usage for a transformer)
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
Since the resistance is fixed, to set the power you need to vary the voltage and current. This is what the transformer is for.
$endgroup$
– evildemonic
55 mins ago
$begingroup$
@soundslikefiziks I think you've missed two points: 1) Stepping down the voltage makes it safer - if the voltage is less than 50V you are unlikely to be electrocuted if you touch the element. 2) For a given wattage, you can use high voltage and low current, or low voltage and high current. High voltage and low current means a high resistance - a long, thin resistance wire which may be fragile. Low voltage and high current implies a short, fat resistance wire, which is sturdier.
$endgroup$
– Simon B
39 mins ago
add a comment |
$begingroup$
Power in a heater is given by the equation $ P = VI $ where P is power (watts), V the applied voltage (volts) and I the current (amps). You can see that there are multiple ways to achieve a given power - high voltage / low current - low voltage / high current.
For a transformer the relationship between input and output is given by $ P_{in} = P_{out} $ (ignoring the few percent losses in the transformer). From the previous formula we can write $ V_{in}I_{in} = V_{out}I_{out} $. This allows us to step the voltage up or down to meet the requirements of the load.
... but since the watts on both sides of the transformer are supposed to be identical, wouldn't the heating element dissipate the same energy with and without the transformer?
Yes, if the resistance of the wire is the same. A high voltage heater will use a very thin wire with high resistance. If this proves too fragile or too thin for the application then a thicker wire can be used but the current will have to increase to get the same current density in the wire. Since the wire is thicker it has a lower resistance so a lower voltage can be used too. An example is the butcher's bag sealing machine which uses an 'impulse' element nichrome (or similar) wire to seal the bag. Here a certain thickness of seal may be required and so a lower voltage, higher current is required. The transformer 'transforms' the voltage and current to match the heater and provides electrical isolation from the mains eliminating a shock hazard.
answered 1 hour ago
TransistorTransistor
81.5k778176
$endgroup$
Power in a heater is given by the equation $ P = VI $ where P is power (watts), V the applied voltage (volts) and I the current (amps). You can see that there are multiple ways to achieve a given power - high voltage / low current - low voltage / high current.
For a transformer the relationship between input and output is given by $ P_{in} = P_{out} $ (ignoring the few percent losses in the transformer). From the previous formula we can write $ V_{in}I_{in} = V_{out}I_{out} $. This allows us to step the voltage up or down to meet the requirements of the load.
... but since the watts on both sides of the transformer are supposed to be identical, wouldn't the heating element dissipate the same energy with and without the transformer?
Yes, if the resistance of the wire is the same. A high voltage heater will use a very thin wire with high resistance. If this proves too fragile or too thin for the application then a thicker wire can be used but the current will have to increase to get the same current density in the wire. Since the wire is thicker it has a lower resistance so a lower voltage can be used too. An example is the butcher's bag sealing machine which uses an 'impulse' element nichrome (or similar) wire to seal the bag. Here a certain thickness of seal may be required and so a lower voltage, higher current is required. The transformer 'transforms' the voltage and current to match the heater and provides electrical isolation from the mains eliminating a shock hazard.
answered 1 hour ago
TransistorTransistor
81.5k778176
answered 1 hour ago
TransistorTransistor
81.5k778176
answered 1 hour ago
TransistorTransistor
81.5k778176
answered 1 hour ago
TransistorTransistor
81.5k778176
81.5k778176
$begingroup$
"and provides electrical isolation from the mains eliminating a shock hazard." so the benefit of connecting a transformer after a household socket is just so that the high current wont switch on the breaker ?
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
i mean, assuming we have a thicker cable like you say and we need to run more current through it, we can theoretically connect it to the 110v outlet without a breaker, and it could potentially provide much more current than it's stepped down voltage on the transformer. so "bypassing the breaker amp limit" is the only benefit i see now for using a transformer. (but i am sure my understanding still hasn't fully clicked in. so that can't be the only usage for a transformer)
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
Since the resistance is fixed, to set the power you need to vary the voltage and current. This is what the transformer is for.
$endgroup$
– evildemonic
55 mins ago
$begingroup$
@soundslikefiziks I think you've missed two points: 1) Stepping down the voltage makes it safer - if the voltage is less than 50V you are unlikely to be electrocuted if you touch the element. 2) For a given wattage, you can use high voltage and low current, or low voltage and high current. High voltage and low current means a high resistance - a long, thin resistance wire which may be fragile. Low voltage and high current implies a short, fat resistance wire, which is sturdier.
$endgroup$
– Simon B
39 mins ago
add a comment |
$begingroup$
"and provides electrical isolation from the mains eliminating a shock hazard." so the benefit of connecting a transformer after a household socket is just so that the high current wont switch on the breaker ?
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
i mean, assuming we have a thicker cable like you say and we need to run more current through it, we can theoretically connect it to the 110v outlet without a breaker, and it could potentially provide much more current than it's stepped down voltage on the transformer. so "bypassing the breaker amp limit" is the only benefit i see now for using a transformer. (but i am sure my understanding still hasn't fully clicked in. so that can't be the only usage for a transformer)
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
Since the resistance is fixed, to set the power you need to vary the voltage and current. This is what the transformer is for.
$endgroup$
– evildemonic
55 mins ago
$begingroup$
@soundslikefiziks I think you've missed two points: 1) Stepping down the voltage makes it safer - if the voltage is less than 50V you are unlikely to be electrocuted if you touch the element. 2) For a given wattage, you can use high voltage and low current, or low voltage and high current. High voltage and low current means a high resistance - a long, thin resistance wire which may be fragile. Low voltage and high current implies a short, fat resistance wire, which is sturdier.
$endgroup$
– Simon B
39 mins ago
$begingroup$
"and provides electrical isolation from the mains eliminating a shock hazard." so the benefit of connecting a transformer after a household socket is just so that the high current wont switch on the breaker ?
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
"and provides electrical isolation from the mains eliminating a shock hazard." so the benefit of connecting a transformer after a household socket is just so that the high current wont switch on the breaker ?
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
i mean, assuming we have a thicker cable like you say and we need to run more current through it, we can theoretically connect it to the 110v outlet without a breaker, and it could potentially provide much more current than it's stepped down voltage on the transformer. so "bypassing the breaker amp limit" is the only benefit i see now for using a transformer. (but i am sure my understanding still hasn't fully clicked in. so that can't be the only usage for a transformer)
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
i mean, assuming we have a thicker cable like you say and we need to run more current through it, we can theoretically connect it to the 110v outlet without a breaker, and it could potentially provide much more current than it's stepped down voltage on the transformer. so "bypassing the breaker amp limit" is the only benefit i see now for using a transformer. (but i am sure my understanding still hasn't fully clicked in. so that can't be the only usage for a transformer)
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
Since the resistance is fixed, to set the power you need to vary the voltage and current. This is what the transformer is for.
$endgroup$
– evildemonic
55 mins ago
$begingroup$
Since the resistance is fixed, to set the power you need to vary the voltage and current. This is what the transformer is for.
$endgroup$
– evildemonic
55 mins ago
$begingroup$
@soundslikefiziks I think you've missed two points: 1) Stepping down the voltage makes it safer - if the voltage is less than 50V you are unlikely to be electrocuted if you touch the element. 2) For a given wattage, you can use high voltage and low current, or low voltage and high current. High voltage and low current means a high resistance - a long, thin resistance wire which may be fragile. Low voltage and high current implies a short, fat resistance wire, which is sturdier.
$endgroup$
– Simon B
39 mins ago
$begingroup$
@soundslikefiziks I think you've missed two points: 1) Stepping down the voltage makes it safer - if the voltage is less than 50V you are unlikely to be electrocuted if you touch the element. 2) For a given wattage, you can use high voltage and low current, or low voltage and high current. High voltage and low current means a high resistance - a long, thin resistance wire which may be fragile. Low voltage and high current implies a short, fat resistance wire, which is sturdier.
$endgroup$
– Simon B
39 mins ago
add a comment |
$begingroup$
If you have a 1000 Watt kettle designed for use in North America, where we have 120V power in the kitchen, then take it to Europe where they have 240V, the kettle will consume 4000 watts (resistance unchanged, but double voltage, power is voltage squared over resistance).
To use the kettle safely in Europe, you will need a step-down transformer to convert the 240V supply to the 120V that the kettle expects. With the step-down transformer the kettle will consume 1000 watts, and the transformer will draw 1000 watts from the 240V source.
answered 53 mins ago
Peter BennettPeter Bennett
37k12967
$endgroup$
add a comment |
$begingroup$
If you have a 1000 Watt kettle designed for use in North America, where we have 120V power in the kitchen, then take it to Europe where they have 240V, the kettle will consume 4000 watts (resistance unchanged, but double voltage, power is voltage squared over resistance).
To use the kettle safely in Europe, you will need a step-down transformer to convert the 240V supply to the 120V that the kettle expects. With the step-down transformer the kettle will consume 1000 watts, and the transformer will draw 1000 watts from the 240V source.
answered 53 mins ago
Peter BennettPeter Bennett
37k12967
$endgroup$
add a comment |
$begingroup$
If you have a 1000 Watt kettle designed for use in North America, where we have 120V power in the kitchen, then take it to Europe where they have 240V, the kettle will consume 4000 watts (resistance unchanged, but double voltage, power is voltage squared over resistance).
To use the kettle safely in Europe, you will need a step-down transformer to convert the 240V supply to the 120V that the kettle expects. With the step-down transformer the kettle will consume 1000 watts, and the transformer will draw 1000 watts from the 240V source.
answered 53 mins ago
Peter BennettPeter Bennett
37k12967
$endgroup$
If you have a 1000 Watt kettle designed for use in North America, where we have 120V power in the kitchen, then take it to Europe where they have 240V, the kettle will consume 4000 watts (resistance unchanged, but double voltage, power is voltage squared over resistance).
To use the kettle safely in Europe, you will need a step-down transformer to convert the 240V supply to the 120V that the kettle expects. With the step-down transformer the kettle will consume 1000 watts, and the transformer will draw 1000 watts from the 240V source.
answered 53 mins ago
Peter BennettPeter Bennett
37k12967
answered 53 mins ago
Peter BennettPeter Bennett
37k12967
answered 53 mins ago
Peter BennettPeter Bennett
37k12967
answered 53 mins ago
Peter BennettPeter Bennett
37k12967
37k12967
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1
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Why are you talking about "wattage" when citing some current reasoning?
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– Eugene Sh.
1 hour ago
$begingroup$
@EugeneSh. because i don't understand the current reasoning, i thought power is the same according to P=IV
$endgroup$
– soundslikefiziks
1 hour ago
$begingroup$
The power is the same, but the voltage and the current can vary. If your heater is requiring more (or less) voltage than provided, you need a transformer.
$endgroup$
– Eugene Sh.
1 hour ago
1
$begingroup$
The resistor will dissipate $V^2/R$. Where $V$ will depend on the transformer.
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– Eugene Sh.
1 hour ago
1
$begingroup$
Same as what? If the voltage on your supply is much higher than the $V$ above, then if you connect resistor directly to it the power will be much higher as well. The power (on both sides) is determined by the load, not by the transformer.
$endgroup$
– Eugene Sh.
1 hour ago