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524 Electricity: Calculate monthly charge for running a scroll saw

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CMP is installing a new transformer to supply power to my woodworking shop. Its primary side has 200 turns (110 volts), and its secondary side had 500 turns. It supplies power to the following circuit: (refer to attachment).

CMP charges me $0.015 per kWhr. My scroll saw (item R3) runs for 45 hours per month. What is my monthly charge for running the scroll saw?

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EXTRA POINTS PROB. 2

CMP is installing a new transformer to supply power to my woodworking shop. Its primary side has 200 turns (110 volts), and its secondary side had 500 turns. It supplies power to the following circuit:
R1 = 30  ...

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