Question

[ A transformer is used to operate a 24V 48W lamp from the mains of 240V, assume its efficiency is 100% 1.)Calculate the current in the primary coil (2 marks) ii.)Determine the turn ratio of the transfomer (2 marks)​

Answer 1

Since transformer is ideal,
Input Power = Output Power
VI = 48
(240)I = 48
I = 0.2 A

Turn Ratio
= output voltage / input voltage
= 24/240
= 0.1