Transformer example problem

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Problem:

An ideal transformer with a 300 turn primary connected to a 480 V, 60 Hz supply line is to output 120 V from the secondary. If a 100 Ω resistor is connected across the secondary, determine: A) How many turns the secondary must have. B) The current through the resistor, C)The current drawn through the primary.

Solution:

Part A:



Where Voltage across primary, Voltage across secondary, Number of turns in primary, Number of turns in secondary




Part B:

The voltage across the secondary is given in the problem statement as 120 volts. Using ohms law, , we can solve for the current.