Question

(a) Define power. What is the S.I. unit of power and commercial unit of power?
(b) A tube light of 80 W is used for 8 hours per day. Calculate the unit of energy consumed in 1 day by the tube light.

Answer 1

Answer:

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Explanation:

power in regardance of electricity

Electrical power is the rate at which electrical energy is converted to another form, such as motion, heat, or an electromagnetic field. The common symbol for power is the uppercase letter P.

What is the S.I. unit of power and commercial unit of power

The standard unit is the watt,symbolized by W

A tube light of 80 W is used for 8 hours per day. Calculate the unit of energy consumed in 1 day by the tube light.

Electrical energy consumed by the bulb per day = P x t = 80W x  8H = 640 Wh

1 unit = 1 kW h = 1000 W h

1 W h = (1/1000) unit

640 W h = 0.640 unit

Electrical energy consumed by the bulb per day = 0.64 unit