Question

A 100 watt electric bulb is used for five hours. How much energy is consumed
by the bulb?

Answer 1

Answer:

Given, power of the electric bulb,

P=100W=(100/1000)kW=0.1kW ;

time for which bulb is used, t=5h

As P=

t

W

or W=Pt

or W=0.1kW×5h=0.5kWh

Answer 2

Answer:

$\large\mathbb{\underline\purple{ANSWER}}$

Given, power of the electric bulb,

P=100W=(100/1000)kW=0.1kW ;

time for which bulb is used, t=5h

As P= $\dfrac{t}{W}$ or W= $\dfrac{P}{t}$

or W=0.1kW×5h=0.5kWh