Question

An electric bulb of rating $\text{50W}$ is used for $\text{8hr}$ in one day. Find the number of units of energy used by the electric bulb. $1KWh=1unit$

• A. 200 unit
• B. 0.4 unit
• C. 0.6 unit
• D. 400 unit

Answer 1

The correct option is B

0.4 unit

$\text{50 W = 0.05 kW}$
$\text{So, power = 0.05}\times \text{8 h = 0.4 kWh = 0.4 unit.}$