Embibe Experts Solutions for Chapter: Alternating Current, Exercise 1: Punjab Board-2018

Define resonant frequency of LCR series circuit.

A capacitor of unknown value and an inductor of $0.1 \mathrm{H}$ and a resistor of $10\Omega$ are connected in series to a $220 \mathrm{V}, 50 \mathrm{Hz}$ac source. It is found that the power factor of circuits is unity. Calculate the capacitance of capacitor and maximum amplitude of the current..

With the help of labelled diagram, describe the principle, construction and working of a transformer.

A series L-C-R circuit with $\mathrm{R}=20 \mathrm{ohm}, \mathrm{L}=1.5 \mathrm{henri}, \mathrm{and} \mathrm{C}= 35\mathrm{\mu F}$ is connected to a variable frequency $200 \mathrm{V}$ a.c.supply.When the frequency of the supply equals the natural frequency of the circuit, what is the average power transferred to the circuit in one complete cycle.