Question

How many hours must 200 watt bulb glow to consume 1 unit of electrical energy?

Answer 1

A Kilowatt Hour is 1000 watts per hour. So a 40 watt light bulb (if rated at the Voltage of 110 volts) would use 40 watts per hour. Power is defined as the amount of energy used per unit time, therefore a 40W lamp consumes 40 watts in 1 hr/ 6hrs/over its lifetime.

Answer 2

For 5 hours it must glow to consume 1 unit of electrical energy.

Explanation:

It is given that,

Power of the bulb, P = 200 W

Electrical energy consumed, E = 1 unit

We know that,

1 unit = 1 kWh

or 1 unit = 1000 Wh

We know that power of an electrical appliances is equal to energy consumed per unit time. It is given by :

$P=\dfrac{E}{t}$

$t=\dfrac{E}P}$

$t=\dfrac{1000\ Wh}{200\ W}$

t = 5 hours

So, for 5 hours it must glow to consume 1 unit of electrical energy. Hence, this is the required solution.

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