EXERCISE 7.1

Choke coil is a series

A variable inductor is connected to an AC source. When inductance increases, Then reactance

Reading shown by the hot wire voltmeter used in the circuit here is

In the following circuit, there are two branches. One branch consists of a resistor and capacitor. The other branch consists of resistance and inductor. Find condition such that
(a) Phase difference between voltage and current in two branches is the same.
(b) Magnitude of current in the two branches is the same.
(c) Total current is in phase with the total voltage.

$220 \mathrm{V}$ AC voltage is supplied to circuit consisting of a resistance of $4 \mathrm{\Omega }$ and inductive reactance of $3 \mathrm{\Omega }.$ Find current and power factor in the circuit.

A $100 \mathrm{V}$ ac circuit with frequency $50 \mathrm{Hz}$ is applied across a resistance of $10 \mathrm{\Omega }$ and capacitor of $500 \mu \mathrm{F}.$ Find current and phase difference between voltage and current.

EMF, applied and current in an A.C. circuit are $E=10\sqrt{2} \sin \omega t \mathrm{V}$ and $I=5\sqrt{2} \cos \omega t \mathrm{A}$ respectively. The average power loss in the circuit is,