Question

A transformer has an efficiency of 80% . it works at 4kwand 100 v . if secondary voltage is 240 , the current in primary coil is?

Answer 1

Answer:

= 40 A

Step-by-step explanation:

Efficiency of transformer,

      η = Output power / Input power

         = Vs is / Vp ip

But          P = Vi

=>           4 × 1000 = 100 × i

                  i = 40 A

The current in the primary coil is 40 A

Good luck !!