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  4. In a step up transformer, the turn ratio is 1: 2. A Leclanche cell (e.m.f. 1.5 V) has been connected across the primary, The voltage across secondary will be :

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Q. In a step up transformer, the turn ratio is $1 : 2$. A Leclanche cell (e.m.f. $1.5 \,V$) has been connected across the primary, The voltage across secondary will be :

Haryana PMTHaryana PMT 2001

Solution:

Leclanche cell works on direct current and thus gives out direct current. The ratio given here won't work since the transformers work on alternating current not on direct current. Thus the voltage developed in the secondary would be 0V.