An ideal transformer has turns in the primary and turns in the secondary
PHYSICS · Multi-part · CBSE · Physics · Alternating Current · Alternating Current
Problem
An ideal transformer has Np=1000 turns in the primary and Ns=100 turns in the secondary. The primary is connected to a 220V, 50Hz supply. Initially, a single 50Ω resistor is connected across the secondary. Later, an identical 50Ω resistor is connected in parallel with the first one across the secondary.
(a) Calculate the rms current in the primary before the second resistor is connected.
(b) Calculate the rms current in the primary after both resistors are connected in parallel.
(c) Find the percentage increase in the transformer’s input power due to the addition of the second resistor.