Question

The energy in kilowatt hour is consumed in operating ten 50W bulbs for 10 hours per day in a month of 30 days is

• A. 1500
• B. 15000
• C. 15
• D. 150

Answer 1

The correct option is D 150

Let,
$N$ be the number of bulbs $=10$
$P$ be the power of each bulb $=50$ Watt
$T$ be the time $=30\times 10=300$ hr
Now the energy $E$, consumed in operating the bulbs is
$E=NPT$
$E=10\times 50\times 300$ Watt-hr
$E=150$ kilowatt-hr