Question

Answer the following question.

Question 6 A battery charger meant for a series connection of ten nickel-cadmium batteries (total emf of 12.5 V DC) needs to have a 15.0 Voutput to charge the batteries. It uses a step-down transformer with a 200-loop primary and a 120 V input. How many loops should there be in the secondary coil? a. 37 b. 25+ c. 13 d. 98 e. 73

Answer 1

as

primary voltage x secondary coils = secondary voltage x primary coils

=> 120 x secondary coils = 15 x 200

=> secondary coils = 25

so answer (b) is correct