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# Basics Of Energy And Its Various Forms - Practice Questions & MCQ

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #JEE Main

## Quick Facts

• 2 Questions around this concept.

## Concepts Covered - 1

Energy
• Energy-

1. The energy of a body is defined as its capacity for doing work.

2.  It is a scalar quantity

3. Dimension- $M L^{2} T^{-2}$

4. Unit-

SI unit - Joule

CGS - Erg

and, $1 \text { Joule}=10^{7} \text { Erg}$

1. Mass energy equivalence-

Einstein’s special theory of relativity shows that material particle itself is a form of energy.

The relation between the mass of a particle m and its equivalent energy is given as

$E=m c^{2}$

Where c = velocity of light in vacuum.

E.g - If m =1kg then $E=9 * 10^{16} J$

1. Various forms of energy

•  Mechanical energy (Kinetic and Potential)

• Chemical energy

• Electrical energy

•  Sound energy

• Heat energy

• Light energy

1. Transformation of energy-

Conversion of energy from one form to another is possible through various devices and processes.

Examples are -

• Bulb- Electrical energy gets converted into light energy.

• Speaker-Electrical energy gets converted into sound energy.

• Heater- Electrical energy gets converted into heat energy

## Study it with Videos

Energy

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## Books

### Reference Books

#### Energy

Errorless Physics Vol 1

Page No. : 257

Line : 46