Test Index

JAMB Physics 2011 Paper

Question : 31

Total: 44

Solution:

Concept:

The cost of operating an appliance depends on the total electrical energy consumed, measured in kilowatt-hours (kWh).

Explanation:

Power of the appliance is given by

P = VI = 250 \times 2 = 500\ \mathrm{W}

Energy consumed in six hours is

E = P \times t = 500 \times 6 = 3000\ \mathrm{Wh}

Convert this energy into kWh:

3000\ \mathrm{Wh} = 3\ \mathrm{kWh}

Given that

1\ \mathrm{kWh}

costs

\mathrm{N}4

, the total cost is

3 \times \mathrm{N}4 = \mathrm{N}12

Answer:

\mathrm{N}12

(Option B).

Go to Question:

Prev Question

Next Question