What is electric power?
Answers
Answer:
Electric power is the rate, per unit time, at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Electric power is usually produced by electric generators, but can also be supplied by sources such as electric batteries.
Electric power :
It is the rate of consumption of electrical energy in any circuit or by an electrical device. It is represented by P.
So, Power = Rate of consumption of energy
=> Power = Energy/Time
=> P = E/t
where, E is electrical energy and t is time.
As energy is changed into useful work and also into heat energy. In other words, energy can be changed into work and vice versa.
So, P = W/t
Also, W = V × Q ( Because, V = W/Q => W = V × Q )
=> P = (V.Q)/t
=> P = V (Q/t)
=> P = VI [ Because, electric current ( I ) = Charge(Q)/time(t)
S.I unit of electric power : Watt
One watt : Power is said to be of one watt of any conductor if the potential difference across its two ends is of one volt and a current of one ampere is flowing through it.
1 Watt = 1 Volt × 1 Ampere