Question

A pure resistor is connected across an AC source. Which of the following quantities does not affect heat produced in the resistor over a full cycle?

• A. RMS value of current
• B. Peak value of current
• C. Magnitude of resistance
• D. Frequency of the AC source

Answer 1

The correct option is D Frequency of the AC source

The heat produced in the resistor over a full cycle is,

$E=I_{\text{rms}}^{2}Rt=\frac{I_0^{2}Rt}{2}$

None of the physical quantities$(I_{\text{rms}},I_0,R,t)$ is affected by changing the frequency of the AC source.

Hence, option $\left(D\right)$ is the correct answer.