Question

Define the commercial unit of electrical energy.

Answer 1

1. Electrical energy is the energy derived from the electric potential energy or kinetic energy of the charged particles.
2. The movement of charged particles along/through a medium constitutes current or electricity.
3. The commercial unit of electrical energy is a $\mathrm{kilowatt}-\mathrm{hour}\left(\mathrm{kWh}\right)$.
4. One kilowatt-hour is the energy consumed by an electrical appliance of power one kilowatt $\left(1\mathrm{kW}\right)$ used for one hour.
5. To convert 1kWh into joule

$$\begin{gathered} 1kWh=1000\times 60\times 60Ws \\ or1kWh=1000\times 3600 \\ =3.6\times {10}^{6}J \end{gathered}$$