Question

The energy (in $\text{kWh})$ consumed in operating ten $50\text{W}$ bulbs for $10$ hours per day in a month of $30$ days is

• A. $15$
• B. $150$
• C. $1500$
• D. $15000$

Answer 1

The correct option is B $150$

Energy $=P\times t$ (where $P$ is Power)

For $1$ day :

Using ten bulbs, $E=10\times [50\times 10]=5\text{kWh}$

Thus, For $30$ days :

$E=30\times 5=150\text{kWh}$

Hence, option (b) is the correct answer.