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WAEC Physics 2018 Paper

Question : 32

Total: 50

Solution:

Concept:

For an ideal transformer, the ratio of voltages equals the ratio of turns:

\frac{V_s}{V_p} = \frac{N_s}{N_p}

Explanation:

Here,

V_p = 100\,V

N_p = 100

, and

N_s = 200

Substitute these values into the transformer equation:

\frac{V_s}{100} = \frac{200}{100}

Simplify the right-hand side:

\frac{V_s}{100} = 2

Multiply both sides by 100:

V_s = 200\,V

Answer:

The secondary voltage is

200\,V

, which corresponds to option C.

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