Does a 1k ohm resistor produce the same heat in a AC circuit which has an rms voltage of 10 volts (60 hz.) as it would in a 10 volt DC circuit?
This answers the original version of the question, which asked,
No, the heat produced depends on V2, not V.
As a simple example, consider a sinusoidal AC signal with 10 V peak to peak, and 0 DC component. The average voltage is zero, but it still delivers power to the resistor and the resistor still heats up.
To get the heat produced in the AC circuit to be the same as in the DC circuit, you want the rms voltage (The square root of the mean of the square of the voltage) in the AC circuit to be equal to the DC voltage in the DC circuit.
Edit: As D34dman points out in his answer, there are some special cases where the rms voltage and average voltage happen to work out to the same value.
Provided frequency is high enough, 1k ohm resistor in an AC circuit would produce same heat (a.k.a. power converted as heat ) as as it would in DC circuit provided the RMS (Root Mean Square) value of supplied Voltage is same.
You can read this wiki entry to know more. Proceed to section Average electrical power.
RMS value is dependent on the the nature of AC waveform. RMS value is not always equal to average value. But they can be equal. For example a square wave alternating between 0 and Vpeak with 50% duty cycle they can be equal.
So to answer your question, if you are giving an AC waveform such that its RMS value and Average value is the same, it would produce same heat. If they are different it wont.
I felt compelled to write this answer since @The Photon has some misguided information in his answer. Maybe he assumed that AC signals are necessarily pure sine wave type which goes from +Vpeak to -Vpeak. Which is just a subset of AC signals.
If it's a "perfect" resistor, yes.
But if it has parasitic inductance or capacitance (as all real examples will, except at their self-resonant frequency where the two cancel) then, no, not exactly, though with the exception of wirewound resistors the difference will be small.
protected by W5VO♦ Feb 24 '13 at 8:20
Thank you for your interest in this question.
Because it has attracted low-quality answers, posting an answer now requires 10 reputation on this site.
Would you like to answer one of these unanswered questions instead?