Question

For an ideal step-down transformer, the quantity which is constant for both the coils is
A. current in the coils
B. voltage across the coils
C. resistance of coils
D. power in the coils

Answer 1

Correct Answer - D
For an ideal step-down transformer, power is constant for both the coils.
i.e., Input power = Output power
`therefore V_(p)I_(p) = V_(s)I_(s)` or `(V_(p))/(V_(s))=(I_(s))/(I_(p))`