# Which Coil of a Step up Transformer is Made Thicker and Why? - Physics

Which coil of a step up transformer is made thicker and why?

#### Solution

In a step-up transformer, the primary coil is made of thicker wire.

This is because in a step-up transformer the number of turns in the secondary coil is more than the number of turns in the primary coil.

As E_s/E_p = N_s/N_p > 1 and E_sI_s = E_pI_p

∴ E_s > E_p

But Is < Ip. i.e  more current flows through the primary coil. Therefore, one must use a thicker wire in the primary coil as compared to that in the secondary coil.

Concept: Transformer
Is there an error in this question or solution?

Share