Previous Year Question
Five bulbs each of 100-watt capacity in a tunnel are illuminated continuously for twenty hours. The consumption of electricity will be:
A.
One unit
B.
Two units
C.
Ten units
D.
Twenty units
Correct Answer: C
Detailed Solution
The total power of the five bulbs is—
That is,
Electrical energy is given by—
Therefore, the total energy consumed in 20 hours is—
The commercial unit of electrical energy is the kilowatt-hour (kWh), and—
Therefore,
1 kWh is commonly known as one unit of electrical energy.