SUMMARY
The discussion centers on calculating the resistance of a metal wire at -20°C using the resistance values at 20°C and 90°C. The resistance at 20°C is given as 8.10 ohms, and at 90°C, it is 11.45 ohms. The temperature coefficient of resistance (alpha) is calculated as 4.18e-3. Using the formula R=R(o)[1+alpha(T-To)], the resistance at -20°C is determined to be approximately 6.746 ohms, which is within 10% of the correct value.
PREREQUISITES
- Understanding of resistance and temperature relationships in conductors
- Familiarity with the formula R=R(o)[1+alpha(T-To)]
- Basic knowledge of temperature coefficients of resistance
- Ability to perform calculations involving ohms and temperature variations
NEXT STEPS
- Research the concept of temperature coefficient of resistance in metals
- Learn about the effects of temperature on electrical resistance in conductors
- Explore advanced resistance calculations using different materials
- Study practical applications of resistance temperature relationships in engineering
USEFUL FOR
Students studying physics, electrical engineers, and anyone interested in the properties of materials and their resistance changes with temperature.