Question

A $1000\text{W}$ heater is used for $1\text{hr}$ every day for $30$ days. Find the cost of electricity if the rate is $\text{Rs.}3/\text{unit}$.

• A. $\text{Rs.}90$
• B. $\text{Rs.}30$
• C. $\text{Rs.}70$
• D. $\text{Rs.}60$

Answer 1

The correct option is A $\text{Rs.}90$

We know that $1\text{kWh}$ is the commercial unit of electricity.

So, number of units of electricity utilized,

$n=1\times 1\times 30=30$

So, total cost $=30\times 3=\text{Rs.}90$