# Transformer

Problem 34.45

Electricity is distributed from electrical substations to neighborhoods at 1.5Ã—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.

ANSWER: = Answer not displayed turns

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 1.5Ã—104 line from the substation?

Express your answer using two significant figures.

ANSWER: = Answer not displayed

https://brainmass.com/physics/power/turns-transformer-current-line-substation-384873

## SOLUTION This solution is **FREE** courtesy of BrainMass!

Please see attached for the solution to the following problems.

Problem 34.45

Electricity is distributed from electrical substations to neighborhoods at 1.5Ã—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.

ANSWER: = Answer not displayed turns

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 1.5Ã—104 line from the substation?

Express your answer using two significant figures.

ANSWER: = Answer not displayed

Solution:

Part A: We'll use the voltage ratio and the turns ratio to get the number of turns of the primary coil:

Part B: The power at the primary equals the power in the secondary. So we have:

Â© BrainMass Inc. brainmass.com October 2, 2022, 12:41 pm ad1c9bdddf>https://brainmass.com/physics/power/turns-transformer-current-line-substation-384873