Question

(a) Define electric power. Express it in terms of potential difference V and resistance R
(b) An electrical fuse is rated at 2A. What is meant by this statement?
(c) An electric iron of 1 kW is operated at 220 V. Find which of the following fuses that
respectively rated at 1 A, 3 A and 5 A can be used in it.​

Answer 1

Answer:

a)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. ... It is usually supplied to businesses and homes (as domestic mains electricity) by the electric power industry through an electric power grid.

P = V²/R

b)This means that 2A is the maximum current that can pass through the Fuse.

c)P = V²/ R = V²/V * I = V * I

Therefore, I = P / V = 1000/220 = 4.55 A

Therefore, Only 1A and the 3A Fuse can be used for this electric Iron.

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