Embibe Experts Solutions for Chapter: Alternating Current, Exercise 1: Nagaland Board-2020

Define power in an A.C circuit and obtain an expression for the average power over a complete cycle in case of a circuit containing inductance, resistance and capacitance. What is meant by wattless current?

With the help of a labelled diagram, explain the working of a transformer. Write any two sources of energy loss in a transformer.

A circuit has a resistance of $12\Omega$ and an impedance of $15 \Omega$. The power factor of the circuit will be

Name any one application of electrical resonance phenomena.

Define the term ‘$\mathrm{rms}$ value of an AC’. Obtain a relation between the$\mathrm{rms}$ value and the peak value of AC.

Show that the total energy of LC circuit in $\mathrm{V}={\mathrm{V}}_{\mathrm{E}}\frac{1}{2}\frac{{\mathrm{q}}_{\mathrm{m}}^2}{\mathrm{C}}$.

Define average power of an AC circuit and derive an expression for average power in LCR circuit. What is the value of average power in a purely resistive circuit?

An electric bulb is rated $220 \mathrm{volt}, 100 \mathrm{watt}$. Power consumed by it when operated on $110 \mathrm{volt}$ is