SI unit of work | What is the SI unit of work
- Joule
Hello students here we are going to learn about the essential unit of SI system i.e. joule.
Joule is unit of work, energy (heat energy, kinetic energy, potential energy etc.) We know that according the definition, work done is the product of force and displacement.
Then
Work done = force × displacement
Where F = force applied to object
s = displacement of object.
From the definition, SI unit of the work will be,
SI unit = newton.meter
= N.m
We also familiar that, Sir Joules’ has given law to find the heat produced (H) in conductor of resistance ‘R’ carries current ‘I’ for time ‘t’ given as,
H = I^2 Rt
The law is known as Joule’s law. For his tremendous contribution in field of physics, his name is given as unit of energy.
Therefore,
newton.meter = joule
i.e. N.m = J
If one wants to convert joule in to CGS, then
We know that,
1 N= 105 dynes, 1 m= 100 cm
1 joule = 105 ×102 dyne. cm
1 joule = 107 erg
( where erg is CGS unit of work which is equal to dyne. cm)
Joule is used to measure different forms of energy also. But the most common form of energy i.e. heat energy is calculated in joule and then converted in to calories.
Where,
1 cal = 4.18 joule
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