Question

A transfomer has 10000 turns and 240V,0.2A in primary coil. If the current through secondary coil is 0.4 A

find the voltage and number of turns in the secondary coil

Answer 1

Formula : N1/N2 =V1/V2 (Turns Ratio)

Where N is the number of turns in the coil and V is the voltage across the coil. Subscript 1 denotes primary side and subscript 2 denotes secondary side.

Therefore N2=N1*(V2/V1)

N2=1000x(400/250)

N2= 1600 turns.

1600 turns are required in the secondary coil to induce a voltage of 400V in the secondary side when the primary side voltage is 250V.

This is known as a step up transformer.