Test Index

JAMB Physics 2020 Paper

Question : 35

Total: 38

Which of the following instruments consumes the highest current?

Solution:

Concept:

The current consumed by an instrument is found using the power-voltage relation

I = \frac{P}{V}

Explanation:

Instrument I:

I = \frac{1000}{250} = 4 \, \mathrm{A}

Instrument II:

I = \frac{110}{220} = 0.5 \, \mathrm{A}

Instrument III:

I = \frac{30}{6} = 5 \, \mathrm{A}

Instrument IV:

I = \frac{500}{110} = 4.55 \, \mathrm{A}

The calculated currents are

4 \, \mathrm{A}

0.5 \, \mathrm{A}

5 \, \mathrm{A}

, and

4.55 \, \mathrm{A}

Instrument III draws the largest current,

5 \, \mathrm{A}

Answer:

C. III

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