Question

= WHAT IS ENERGY?SI UNIT OF ENERGY ITS DERIVATION ​

Answer 1

Answer:

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Explanation:

Joule is SI unit of work or energy. As work = force xx distance. = (mass xx acc.)

Answer 2

Answer:

The commercial unit of energy is 1 kWh. One kilowatt-hour is defined as the amount of energy that is consumed by a device in one working hour at a constant rate of one kilowatt. The SI unit of energy is Joule.

Potential energy is the work done to take a body to a certain height. For a body with mass m, h is the distance to which it is raised and g is the gravitational force acting on the body, then work done W is given as:

W = force * displacement

W = mg * h

∴ W = mgh

As the work done is equal to mgh which is gained by the object, potential energy Ep is given as:

Ep = mgh