Question

An electric refrigerator rated $1$kW operates $5$ hours /day.The cost of energy to operated it for $30$ days at $Rs.3.00$ per unit is

• A. $Rs.500$
• B. $Rs.300$
• C. $Rs.450$
• D. $Rs.400$

Answer 1

The correct option is C $Rs.450$

Given,

$Time=t=5hrs$

$Energy = P\times t =1\times5 = 8

KWh$

Energy consumption in one day $=5KWh$

Energy consumption in the month of June $=5\times 30=150KWh$

Total cost $=monthlyconsumption\times rate$ $=Rs150\times 3=Rs450$