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# Transformer

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Problem 34.45
Electricity is distributed from electrical substations to neighborhoods at 1.5×104 . This is a 60 oscillating (AC) voltage. Neighborhood transformers, seen on utility poles, step this voltage down to the 120 that is delivered to your house.
Part A
How many turns does the primary coil on the transformer have if the secondary coil has 110 turns?
Express your answer using two significant figures.

Part B
No energy is lost in an ideal transformer, so the output power from the secondary coil equals the input power to the primary coil. Suppose a neighborhood transformer delivers 300 at 120 . What is the current in the 1.5×104 line from the substation?
Express your answer using two significant figures.

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Problem 34.45
Electricity is distributed from electrical substations to neighborhoods at 1.5×104 . This is a 60 oscillating (AC) voltage. Neighborhood transformers, seen on utility poles, step this voltage ...

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