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Question

if the primary of a transformer has 10 turns and the secondary of the transformer has 20 turns to what type of transformer does it belongs.express mathematical form related to this [it is 4 mark question]

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Solution

Since, no. of turns in secondary coil are more than that of the no. of turns in primary coil (i.e, n_s > n_p). Hence, it is a step up transformer.
Mathematical form :
$E_{s} = E_{p} \frac{n_{s}}{n_{p}} w h e r e, E_{s} i s v o l t a g e a c r o s s s e c o n d a r y c o i l a n d E_{p} i s t h e v o l t a g e a c r o s s t h e p r i m a r y c o i l$

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