Amisha Singh Solutions for Chapter: Work and Energy, Exercise 2: Exercise

What is the SI unit of power?

Name the devices in which nuclear energy changes into electrical energy

Name the devices in which light energy changes into electrical energy.
 

Explain how the total energy of a swinging pendulum at any instant of time remains conserved. Illustrate your answer with the help of a labelled diagram.

How much electric energy in $\mathrm{kWh}$ is consumed by an electrical appliance of $1000 \mathrm{Watt}$ when it is switched on for $60 \mathrm{minutes}$?

A certain household consumes $650 \mathrm{units}$ of electricity in a month. How much is this electricity in Joule?

Five electric fans of $120$ watt each are used for $4$ hours. Calculate the electrical energy consumed in kilowatt hours.

A ball falls to the ground as shown below:

 What is the potential energy of ball at B? State the law which is used for answering the question.