Question

A mixer of 100$\Omega$ resistance is connected to an A.C. source of 200V and 50 cycles/sec. The value of average potential difference across the mixer will be:

• A. 308 V
• B. 264 V
• C. 220 V
• D. zero

Answer 1

Answer: (D)

zero

We need to find the average potential difference across the mixer. Here by average we mean average over a long period of time. As we know in one complete cycle, average voltage across the mixer is zero. ( In one complete cycle current changes the direction and net voltage across a resistor is zero).
So when in one complete cycle voltage drop across the resistor is zero, then the average voltage drop across the resistor (mixer) is zero.