Explain electrical energy and drive its formula.

Electrical energy is the energy newly derived from electric potential energy or kinetic energy.

Suppose the electric current is flowing through some resistor (R). To flow this current continuously the battery has to provide energy to every electric charge. Now, the work required to keep the charge Q in motion by the battery of voltage of V is

W = VQ

From the definition of electric current,

Q = It

.: W = VIt

According to Ohm’s Law, V = IR

W = (IR)(I)(t)

The above equation is called Joule’s Law.