Alternating current cannot be measured by a D | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) In a $DC$ ammeter,a coil is free to rotate in the magnetic field of a fixed magnet.If an alternating current is passed through such a coil,the tor

Vedclass · Accepted Answer

The average value of a complete cycle is zero.

Vedclass · Answer

(B) In a $DC$ ammeter,a coil is free to rotate in the magnetic field of a fixed magnet.If an alternating current is passed through such a coil,the torque will reverse its direction each time the current changes direction.Since the frequency of $AC$ is typically high,the coil cannot follow the rapid changes in torque due to its inertia.Consequently,the average value of the torque over a complete cycle is zero,and the pointer remains at the zero position.

Alternating current cannot be measured by a $DC$ ammeter because:

Similar Questions

An alternating current is given by the equation $i = i_1 \cos \omega t + i_2 \sin \omega t$. The r.m.s. current is given by

The mean value of current for half cycle for a current variation shown by the graph is

In an $AC$ circuit,the peak value of voltage is $423 \ V$. Its effective voltage is .......... $V$.

An alternating current at any instant is given by $i = [6 + \sqrt{56} \sin (100 \pi t + \frac{\pi}{3})] \ A$. The rms value of the current is . . . . . . . (in $A$)

$A$ periodic voltage $V$ varies with time $t$ as shown in the figure. $T$ is the time period. The $r.m.s.$ value of the voltage is:

Vedclass Test Series

Exam Paper Generator

Online Exam Module