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 $ac$ source is rated at $220V, 50 Hz$. The time taken for voltage to change from its peak value to zero is.....$sec$.

What is the average value of the $AC$ voltage over a complete cycle?

An $AC$ source is rated $222 \,V, 60 \,Hz$. The average voltage is calculated in a time interval of $16.67 \,ms$. It

An alternating current in a circuit is given by $I = 20 \sin (100 \pi t + 0.05 \pi) \ A$. The r.m.s. value and the frequency of the current respectively are:

An alternating current is represented by the equation,$i = 100 \sqrt{2} \sin(100 \pi t) \ A$. The $\text{RMS}$ value of current and the frequency of the given alternating current are:

Vedclass Test Series

Exam Paper Generator

Online Exam Module