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The number of turns in the primary coil when the transformer is used to step down the AC emf from 220V to 6V , assuming that it has 18 turns in its secondary coil is |
73 220 660 440 |
660 |
$\frac{V_s}{V_p} = \frac{N_s}{N_p} $ $\Rightarrow N_p = \frac{V_p}{V_s} N_s = \frac{220}{6} \times 18 = 660$ |
