JAMB - Physics (2020 - No. 15)
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
Explanation
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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