What is power? What is energy?.

What is power.

Power is how much strength is required to push an article.

Before knowing how to calculate the power, Just understand how the power is scale .

Power scaled by (W) Watt.

Power can be calculated as followed.

Power(W) =Current(Ah) * Voltage (V).

A -> amperes.   V->Volt     W -> Power

Example 1
A video uses 30 A at 12 V. Its power
requirement in watts is:
30 A × 12 V = 360 W


Example 2
A pump uses 10 A at 48 V. Its power
requirement in watts is:
10 A × 48 V = 480 W

Example 3
A light uses 1.5 A at 12 V. Its power
requirement is:

1.5 A × 12V = 18W

Example 4
If a refrigerator using 120 W requires a current
of 10 A, what voltage is present?
?? V × 10 A = 120 W

120W ÷ 10A = 12 V

And Final one : Practical  Question

If a 24 W light is connected to a 12 V source of electricity, how much current
will flow?
12 V × ?? A = 24 W

24 ÷ 12 = 2 A


What is Energy?

The terms power and energy are often confused. 
Power is the ability to do work.
Energy is the total actual work that is done. A large, strong man may have great
power but if he is lazy and sleeps all day, he does little work and produces little

energy.