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WAEC Physics 2020 Paper

Question : 13

Total: 51

\text{An electrical device has 50 turns in its primary coil and 20 turns in the secondary coil. The device can be a/an?}

Solution:

Concept:

In a transformer, the ratio of primary to secondary turns determines whether it steps voltage up or down.

Explanation:

Here, the primary coil has

N_p = 50

turns and the secondary coil has

N_s = 20

turns.

Since

N_p > N_s

, the secondary voltage is lower than the primary voltage.

A device with more turns on the primary than on the secondary is called a step-down transformer.

Generators are not based on turn ratio, so options C and D are not correct.

Answer:

B. step-down transformer

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