Question

An electric bulb of 100 watts is used for 3 days calculate the electrical energy consumed per day

Answer 1

Answer:

Explanation:

Electrical energy consumed by the bulb per day = P x t = 60 W x 6h = 360 Wh

1 unit = 1 kW h = 1000 W h

1 W h = (1/1000) unit

360 W h = 0.360 unit

Electrical energy consumed by the bulb per day = 0.36 unit

Answer 2

Given that,

Power of electric bulb, P = 100 W

Time, t = 3 days

To find,

The electrical energy consumed per day.

Solution,

Power of an object is defined as the electrical energy consumed per unit time.

We know that,

100 W = 0.1 kW

and 1 day = 24 h

3 days = 72 h

Power is :

$P=\dfrac{E}{t}\\\\E=P\times t\\\\E=0.1\ kW\times 72\ h\\\\E=7.2\ kWh$

So, the electrical energy consumed per day is 7.2 kWh.

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