Pls help me with my Resistivity Question in pHysics due tomorrow morning.

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SUMMARY

This discussion focuses on calculating the resistance and properties of copper and iron wires under various conditions. Key problems include determining the length of a copper wire with a specified resistance of 5.0Ω, calculating the minimum diameter of copper wire to limit voltage drop to 2% for a motor drawing 10 A from a 240-V source, and finding the potential difference in a copper wire carrying 12 A over a distance of 100m. Additionally, it addresses the temperature coefficient of resistivity for an iron wire, with resistance values given at different temperatures.

PREREQUISITES
  • Understanding of Ohm's Law and resistance calculations
  • Familiarity with the properties of copper and iron conductors
  • Knowledge of temperature coefficients of resistivity
  • Basic electrical circuit concepts, including voltage drop calculations
NEXT STEPS
  • Research the formula for calculating resistance in wires based on length and cross-sectional area
  • Learn about the temperature dependence of resistivity in materials
  • Explore voltage drop calculations in electrical circuits
  • Investigate the properties of different materials used in electrical wiring
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Students studying physics, electrical engineering students, and anyone involved in electrical circuit design or analysis.

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Pls help me..thanks

Homework Statement



17. How long should a copper wire 20 mills in diameter be for it to have a resistance of 5.0Ω?

20. An electric motor draw 10 A from a 240-V source 120 ft away. What is the minimum diameter of the copper wire in mills if the voltage drop is not to exceed 2%?

22. A copper wire 1.0 mm in diameter carries a current of 12 A. Find the potential difference between two points in the wire that are 100m apart.

24. The resistance of a copper wire is 100 Ω @ 20oC. Find its resistance at 0oC and at 80oC

25. An iron wire has a resistance of 2.00 Ω at 0oC and a resistance of 2.46 Ω at 45oC. Find the temperature coefficient of resistivity of the wire
 
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