Question

Calculate the energy emitted by a bulb of 100 watt in 1 hr

Answer 1

Power$(P)$ is the rate at which electric energy performs work.

Work done $=$ Energy consumed $=$ Heat$=Power\times time$

Step 1: Given data

power, $P=100W$

time taken, $t=1hr=1\times60\times60=3600s$

energy consumed, $E=?$

Step 2: Calculating the energy

We know that,

$E=P\times t$

$E=100\times 3600=360000J$

Since,

$1KW=1000W$

Thus,

$E=360kJ$

Hence, the energy emitted by a bulb of $100W$ in $1hr$ is $360kJ$.

#SPJ2