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Lagz
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#1
Report Thread starter 16 years ago
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Need help with the following:

An electric heater consists of a large resistor resistance R, connected across the AC mains supply. The resistor is replaced by a coil which has reisistance R and inductance L. Explain with the aid of a phasor diagram whether the new heater will emit the same power.
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diablo2004
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Report 16 years ago
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I dont know if they teach this at A-level, but the phase of V against I will remain unhanged in the first case (the phasor of I and the phasor of V will point in the same direction)

as a conductor, there will be a phase difference (the phasor of I will be at right angles to the phasor of V)

This means that power (=IV) will be different in the two cases
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