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JAMB Physics 2022 Paper

Question : 19

Total: 40

Solution:

Concept:

Electrical energy dissipated in a resistor equals power multiplied by time.

Explanation:

First, convert the time from minutes to seconds.

t = 2 \text{ minutes} = 2 \times 60 = 120 \text{ s}

Power is given by voltage multiplied by current.

P = VI = 40 \times 0.5 = 20 \text{ W}

Energy dispatched is:

E = P \times t = 20 \times 120

E = 2400 \text{ J}

Answer:

A. 2400 J

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