Copper wire length, iron wire resistance, cost of hall light
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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
Answer: 74m
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.
Answer: 0.0056/°C
Electrical Power Problems:
1. A 75-W hall light is left on continuously. At $0.09 per kilowatt-hour, find the cost per week.
Answer: $1.13
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Solution Summary
The expert examines the copper wire length, iron wire resistance and the cost of hall light.
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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
Answer: 74m
Solution:
The resistance and resistivity are related by the following equation:
ρ=R A/l
where is the resistivity in m,
R is the resistance in ,
A is the cross-sectional area in ...
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