Transformer example problem

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Problem:

An ideal transformer with a 300 turn primary connected to a 240 V, 60 Hz supply line is to output 110 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