Question

A periodic voltage waveform observed on an oscilloscope across a load is shown. A permanent magnet moving coil (PMMC) meter connected across the same load reads

• A. 4 V
• B. 5 V
• C. 8 V
• D. 10 V

Answer 1

The correct option is A 4 V

As PMMC meter reads only DC value or average value and average value is equal to

$V_{avg}=\frac{\text{Area under the curve}}{\text{Total time}}$

$V_{avg}=\frac{(\frac{1}{2}\times 10\times 10)+(-5\times 2)+(5\times 8)}{20}$

$=4V$