Question

A current waveform i(t), shown in the figure, is passed through a Permanent Magnet Moving Coil (PMMC) type ammeter. The reading of the ammeter up to two decimal place is

• A. -0.25 A
• B. -0.12 A
• C. 0.37 A
• D. 0.5 A

Answer 1

The correct option is A -0.25 A


The PMMC ammeter in this case measures the average value of the current

$\therefore I_{average}=\frac{A_1+A_2}{T}$

$=\frac{\frac{1}{2}\times 1\times 1+(-1\times 1)}{2}=\frac{0.5-1}{2}$

= -0.25 A