Transformer
Practice Problems



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Make sure to enter your answers in the specified units .
1
A particular residence uses amps at 120 volts. How much power does the residence use (in watts)?

2
Assuming the wire from the generating plant to the house has a resistance of 90 ohms, how much potential difference will be dropped along the wire (in volts)?

3
What is the actual difference in potential which must be supplied by the generating plant in order for 120 volts to reach the residence?

4
How much power will the generating plant be producing (in watts)?

5
What is the efficiency of this method of power transformer (in percent)?


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