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AV1 = V2
BV × N constant
CV1/V2 = N1/N2 (turn ratio)
DV1/V2 = N2/N1
Answer & Solution
Correct answer: C. V1/V2 = N1/N2 (turn ratio)
Ideal transformer: V1/V2 = N1/N2 = turns ratio. Power conservation (ideal): V1 I1 = V2 I2. So I1/I2 = N2/N1 (currents inversely proportional). Step-up: N2 > N1, voltage rises. Step-down: opposite.
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