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Measurement of Energy

Since, the energy is the ability to do work, the energy of an object  is numerically  equal to  the amount of work a body does. Therefore, energy is also measured in joules.  

                 1 J = 1N * 1 m

One joule is the energy required to move an object over a distance of 1 meter with a force of one Newton.

Question :   How much energy is used by an object through a distance of 400 cm  in the direction of force ?

(Click on the right answer)

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40J 

4J

0.4J

0J

 The energy is measured in two systems of units.

 I.  Metric Systems (S.I Units)

 II.  British System

             In S.I System the unit of energy in joule. One calorie is the amount of heat required to raise 1 gram of pure water from 14.5 to 15.5 degree Celsius  at standard atmospheric pressure.

                          1 cal = 4.185 joules.

                          1 Kcal = 1000 cal = 4185 joules.

             In Btu also call the British thermal unit is the amount of  energy required to raise the temperature of one pound of water one degree Fahrenheit.

 



 

Work

Energy

Sources of energy

Types of energy

Forms of energy

Energy Conservation

Transformation of energy

Measurement of energy

Power

Heat

Combustion engines

Joule's experiment

Fun Facts

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