Embibe Experts Solutions for Chapter: Alternating Current, Exercise 1: Exercise - 1

An AC voltage of $V=220\sqrt{2}\sin \left(100\pi t+\frac{\pi }{2}\right)$ is applied across a DC voltmeter, its reading will be

Energy dissipates in $\mathrm{LCR}$ circuit in 

The potential difference $V$ across and the current $I$ flowing through an instrument in an AC circuit are given by 

$V=5\cos \omega t \mathrm{V}$

$I=2\sin \omega t \mathrm{A}$

The power dissipated in the instrument is

A direct current of $2 \mathrm{A}$ and an alternating current having a maximum value of $2 \mathrm{A}$ flow through two identical resistances. The ratio of heat produced in the two resistances in the same time interval will be

An electric bulb and a capacitor are connected in series with an AC source. On increasing the frequency of the source, the brightness of the bulb

In an AC circuit, a resistance of $R$ ohm is connected in series with an inductance $L$. If phase angle between voltage and current by $45°$, the value of inductive reactance will be

With increase in frequency of an AC supply, the inductive reactance,

With increase in frequency of an AC supply, the capacitive reactance,