A resistor is connected once to a DC source and once to a (rms) AC source
PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences
Problem
A 20Ω resistor is connected once to a 12V DC source and once to a 12V (rms) AC source. In each case it is observed that the resistor becomes equally warm. Explain in one sentence why the rate of heating is the same in both cases.