Question

Calculate the electric energy in SI units, consumed by a 100 W bulb and 60 W fan connected in parallel for 5 minutes.

Answer 1

Step 1- Given Data

The power rating of two bulbs, $P_1=100W$and $P_2=60W$ respectively.

Time $t=5minutes=5\times 60=300seconds.$

Step 2- Finding out the energy consumed by both the bulbs

Energy consumed by the bulb,

$H=Pxt$

So, the energy consumed by the first bulb is,

$H_1=P_{1}xt=100x300=30000J$

The energy consumed by the second bulb is,

$H_2=P_{2}xt=60x300=18000J$

Thus, the total energy consumed by the fan,

$H=H_1+H_2=30000+18000=48000J.$

Thus, the electric energy in SI units consumed by both the bulbs is,$48000J.$