Question

Q7 (a)define electric power. express it in terms of potential difference V and
(b)An electrical fuse is rated at 2A. what is meant by this statement?
(c)An electric iron of 1kW is operated at 220V. find which of the following fuses that respectively rated at 1A, 3A and 5A can be used in it.

Answer 1

Answer:

Electric power is defined as the rate per unit time at which electrical energy is transferred by electric circuit.  

P=VI

P=V×V/R=V^2/R

Answer 2

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.