Question
A 220 V input is supplied to a transformer. The output circuit draws a current 2.0 A at 440 V. If the efficiency of the transformer is 80%, the current drawn by the primary windings of the transformer is
-
3.6 A
-
2.8 A
-
2.5 A
-
5.0 A
Solution
D.
5.0 A
Efficiency is defined as the ratio of output power and input power
i.e. 
