Practice Questions

Potential energy &amp; Kinetic energy:Potential energy is the energy stored in an object due to its position or arrangement. Kinetic energy is the energy of an object due to its movement or motion.Note:The spring of a watch stores elastic potential energy. When a watch is wound, the spring's shape changes and stores potential energy. This potential energy is converted to kinetic energy when the spring is released and unwound, which transfers energy to the watch's moving parts.The amount of energy stored in a spring is proportional to how much it's stretched or compressed. The watch's mechanism, uses the energy stored in the spring to provide a continuous estimate of rotation for a period of time.

Energy stored in a spring in watch-

One Kilowatt hour is equal to-

Solar cell is defined as a device that converts sunlight into electricity. 
A solar cell which is also known as a photovoltaic cell

The device used to convert solar energy into electricity is

The energy possessed by a liquid particle by virtue of its position is called - Potential energyThe energy possessed by a body by virtue of its motion is known as - Kinetic energy

The energy possessed by a body due to its position is called:

Power = Energy consumed / timeEnergy consumed = Power x time Given,Time = 1 minute = 60 sec Power = 100 WEnergy consumed = Power x time= 100 x 60= 6000 J

In 1 minute how much energy does a 100 W electric bulb transfers?

Correct answer is Its potential energy increases

What happens to its potential energy when an object is taken to high altitude?

Joule is the unit of

Correct answer is K. E will increase 9 times

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