Embibe Experts Solutions for Chapter: Alternating Current, Exercise 1: Punjab Board-2019

Define resonant frequency of LCR series circuit.

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

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..

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.