Question

When a resistor has an AC current flowing through it, what happens to the flow of power during an AC cycle? The resistor uses electrical power at a steady rate during the entire cycle. The resistor supplies electrical power in pulses. The resistor uses electrical power during part of the cycle, but supplies electrical power when the current reverses direction The resistor supplies electrical power at a steady rate during the entire cycle. The resistor uses electrical power in pulses.

Answer 1

Power dissipated in a resistor is

P=(1/2)VIcos(phi)

In case of pure resistor, phi=0.

So power dissipated is

P=(1/2)VI= constant

Here, V and I are peak values if voltage and current respectively.

So, a resistor dissipates energy over the entire cycle at a constant rate

Hence, 1st option is correct