Question

A lamp rated $20W$ and an electric iron rated $50W$ are used for $2$ hour everyday. Calculate the total energy consumed in $20$ days.

• A. $14kwh$
• B. $2.8kwh$
• C. $40kwh$
• D. None of these

Answer 1

The correct option is B $2.8kwh$

Energy consumed by lamp in 2 hour $E_l=0.02\times 2=0.04$ kWh per day

Energy consumed by iron in 2 hour $E_i=0.05\times 2=0.1$ kWh per day

$\therefore$ Total energy consumed by both appliance in $20$ days,

$E_T=(E_l+E_i)\times 20=(0.04+0.1)\times 20=2.8$ kWh