A step-up transformer has 25 turns on the primary coil and 790 turns on the seco

Question

A step-up transformer has 25 turns on the primary coil and 790 turns on the secondary coil. If this transformer is to produce an output of 5200V with a 15-mA current, what input current and voltage are needed?

Part A

Express your answer using two significant figures.

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Part B

Express your answer using two significant figures.

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A step-up transformer has 25 turns on the primary coil and 790 turns on the secondary coil. If this transformer is to produce an output of 5200V with a 15-mA current, what input current and voltage are needed?

Part A

Express your answer using two significant figures.

Ii =   A  

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Part B

Express your answer using two significant figures.

Vi =   kV  

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Explanation / Answer

apply In a transformer N1/N2 = V1/V2 = I2/I1

1 ffor primary and 2 for secondary

current i1 = i2 * N2/N1

i1 = 15mA * 790/25

i1 = 0.474 A

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so V1 = V2 *N1/N2

V1 = 5200 * 25/790 = 0.165 K Volts

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