The equation of an alternating emf is $e=200 \sin 400\pi t \mathrm{V}.$ What is the frequency and virtual value of the emf ?

A light bulb is rated $100 \mathrm{W}$ for $220 \mathrm{V}$  ac supply of $50 \mathrm{Hz}.$ Calculate

A light bulb is rated $100 \mathrm{W}$ for $220 \mathrm{V}$  ac supply of $50 \mathrm{Hz}.$ Calculate

the rms current through the bulb.

An alternating voltage given by $v=140\sin 314t$ is connected across a pure resistor of $50\Omega .$ Find

the frequency of the source.

An alternating voltage given by $v=140\sin 314t$ is connected across a pure resistor of $50\Omega .$ Find the rms current through the resistor.

A sinusoidal voltage $v=200 \sin 314t$ is applied to a resistor of $10 \mathrm{\Omega }$ resistance. Calculate the frequency of the supply,

A sinusoidal voltage $v=200\sin 314t$ is applied to a resistor of $10\Omega$ resistance. Calculate the rms value of the voltage.