A bulb of power 60 W is used for 12.5 h each day for 30 days. Calculate the electrical energy consumed.

Given,

Power (P) = 60 W

time (t) = 12.5 h for 30 days

As energy consumed (E) = P × t

$E = 60 \times 12.5 \\[0.5em] \Rightarrow E = 750 \text { Wh}$

Hence, electrical energy consumed in one day = 750 Wh

Electrical energy consumed in 30 days = ?

$E = 750 \times 30 \\[0.5em] E = 22500 \text { Wh} \\[0.5em] E = 22.5 \text { kWh} \\[0.5em]$

Hence, electrical energy consumed in 30 days = 22.5 kWh