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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
for transformer,
Es = Ns, Es = e.m.f of secondary
Ep = Np, Ep = e.m.f of primary
NS = number of turns in secondary
Ns = number of turns in primary
\(\frac{30}{300}\) = \(\frac{x}{100}\)
300X = 3000X
= 10 volts