Question
Which one of the following is NOT the unit of energy?
This question was previously asked in
NDA 2020 GAT Previous Year Paper (06-Sep-2020)
The correct answer is
kg-metre/sec 2
The correct answer is kg-metre/sec2 .
Key Points
CONCEPT :
- kg-metre/sec 2 is the unit of Force.
- F = m × a, where m = mass of object & a = acceleration.
- Joule is a unit of energy and is indicated by 'J'. It is expressed as the work required to produce one watt of power for one second.
- Joule is the unit of work/energy in the International System of Units or (SI).
- Work done is said to be 1 joule, when a force of one newton actually moves a body through a distance of one meter in the direction of applied force.
EXPLANATION :
- Some quantities whose unit are joule
Name of Unit | Symbol | Relation to SI unit |
Joule | J | 1 J = 1 N.m = 1 Watt.sec |
Kilowatt-hour | kW.h | = 3.6 × 10 6 J |
Kilocalorie | kcal | = 4184 J |
| Newton-metre | N-m | 1 Joule |
Energy Density:
- It is defined as the amount of energy stored in a given system or a region of space per unit volume.
- Energy density = Energy stored / volume.
- The SI Unit of Energy Density is Joule/metre 3 or J/m 3. (∵ Energy is measured in joule and volume in m 3).
- The SI base unit is - kg·m −1 s−2
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