Question

A 25 watt electric bulb is used for 10 hours every day how much electricity does it consume each day?

Answer 1

Explanation:

power = energy consumed per unit time

so,

energy = power x time

= 25 x 10x 60x 60 joules

= 900,000 joules or 900 KJ

Answer 2

The electricity consumed by the bulb per day is 250 watt-hour.

Explanation:

The electric power, energy and time is related as

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

Here, P is the power, E is the energy and t is time.

Given P = 25 W, t = 10 hour.

As 25 W bulb  turn it on for 10 hour per day, energy consumed by the bulb per day is

$25W=\frac{E}{10h}$

E = 25 W x 10 h

E = 250 W.h

Thus, the electricity consumed by the bulb per day is 250 watt-hour.

#Learn More: power, energy.

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