NEET2010PhysicsAlternating CurrentActual
A 220 ~V input is supplied to a transformer. The output circuit draws a current of 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
Options
- A3.6 ~A
- B2.8 ~A
- C2.5 ~A
- D5.0 ~A
Correct answer
D. 5.0 ~A
Step-by-step solution
Efficiency is defined as the ratio of output power and input power ie, aligned % & = P _ out P _ in 100= V _s i _s ~V _ p i _ p 100 80 & = 2 440 220 i _ p 100 i _ p & =5 ~A aligned