You need a transformer that will draw 34 W of power from a 220 V (rms) power lin

Question

You need a transformer that will draw 34 W of power from a 220 V (rms) power line, stepping the voltage down to 9.0 V (rms).

Part A

What will be the current in the secondary coil?

Express your answer to two significant figures and include the appropriate units.

3.8 A

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Correct

Part B

What should be the resistance of the secondary circuit?

Express your answer to two significant figures and include the appropriate units.

6.3

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Part C

What will be the equivalent resistance of the input circuit?

Express your answer to two significant figures and include the appropriate units.

You need a transformer that will draw 34 W of power from a 220 V (rms) power line, stepping the voltage down to 9.0 V (rms).

Part A

What will be the current in the secondary coil?

Express your answer to two significant figures and include the appropriate units.

I =

3.8 A

SubmitMy AnswersGive Up

Correct

Part B

What should be the resistance of the secondary circuit?

Express your answer to two significant figures and include the appropriate units.

R =

6.3

SubmitMy AnswersGive Up

Incorrect; Try Again

Part C

What will be the equivalent resistance of the input circuit?

Express your answer to two significant figures and include the appropriate units.

R =

Explanation / Answer

B) the resistance of the secondary circuit is 9/3.8 ohm = 2.36 ohm

C) the windings ratio is Vp/Vs = 220/9 = 24(approx)

So equivalent resistance of input circuit = 242*2.36 ohm = 14080ohm

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