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
How much energy is used by an object through a distance of 400
cm in the direction of force ?
(Click on the
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.