(Answered) Resistivity problems1 how long should a copper wire 04mm in

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Resistivity Problems:

1. How long should a copper wire 0.4mm in diameter be for it to have a resistance of 10ohms? The resistivity of copper is 1.7 x 10-8 Q-m

2. An iron wire has a resistance of 0.20ohms at 20°C and a resistance of 0.30ohms at 110°C. Find the temperature coefficient of resistance of the iron used in the wire.

Electrical Power Problems:

1. A 75-W hall light is left on continuously. At $0.09 per kilowatt-hour, find the cost per week.

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