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JAMB Physics 2020 Paper

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Question : 15

Total: 38

A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil. If the input voltage is 100 volts, the output voltage is

5 volts
10 volts
15 volts
20 volts

Solution:

For transformation, Es = e.m.f. of secondary coil

Ep = Np

Np = e.m.f. of secondary coil

Ns = number of turns in secondary coil

Ns = number of turns in primary coil

$\frac{30}{300}$ = $\frac{x}{100}$ = 300

X = 3000

X = 10 volts

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