Question

A $12HP$ motor has to be operated $8$ hours/day. How much will it cost at the rate of $50$ paisa/kWh in $10$ days

• A. $Rs350$
• B. $Rs358$
• C. $Rs375$
• D. $Rs397$

Answer 1

The correct option is B $Rs358$

Power of motor = $12HP$

=$(12\times 746)$ watt

Total energy used =$(12\times 746)\times (8\times 3600\times 10)$

=$2578176000J$

Cost per unit energy= $\frac{0.5}{{10}^3\times 3600}Rs/J$

$\therefore$ Total cost = $2578176000\times \frac{0.5}{{10}^3\times 3600}=Rs358$