The AC voltage across a resistance can be mea | vedclass

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

Question

(B) standard $DC$ voltmeter cannot measure $AC$ voltage because the average value of an alternating voltage over a full cycle is zero, causing the ins

Vedclass · Accepted Answer

hot wire voltmeter

Vedclass · Answer

(B) standard $DC$ voltmeter cannot measure $AC$ voltage because the average value of an alternating voltage over a full cycle is zero, causing the instrument to show a zero reading.To measure $AC$ voltage, we use an instrument that operates on the heating effect of current, which is independent of the direction of the current.A hot wire voltmeter works on the principle of the heating effect of current $(H = I^2Rt)$, where the deflection is proportional to the square of the current (or voltage). Therefore, it can measure the $RMS$ value of $AC$ voltage.

The $AC$ voltage across a resistance can be measured using a

Similar Questions

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

The $r.m.s.$ value of the current $i = 3 + 4 \sin(\omega t + \pi/3)$ is:

$A$ complex current wave is given by $i = 5 + 5 \sin(100 \omega t) \text{ A}$. Its average value over one time period is given as......$\text{A}$

If a direct current of $a$ ampere is superimposed with an alternating current $I = b \sin \omega t$,then the effective value of the resulting current is

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

Vedclass Test Series

Exam Paper Generator

Online Exam Module