Podcast Beta
Questions and Answers
Explain the concept of temperature coefficient of resistance and its representation in symbols and units.
The temperature coefficient of resistance, represented by the Greek letter α, is the ratio of the change of resistance per degree change of temperature to the resistance at some definite temperature. It is measured in reciprocal degree centigrade (/°C).
Describe the variation of resistance for certain alloys, such as manganin, with respect to temperature.
Certain alloys, such as manganin, show practically no change of resistance for a considerable variation of temperature.
Discuss the behavior of resistance for pure metals, carbon, electrolytes, and insulating materials with respect to temperature.
The resistance of all pure metals increases with an increase in temperature, while the resistance of carbon, electrolytes, and insulating materials decreases with an increase in temperature.
Explain the graphical representation of the variation of resistance for copper conductors and the implications of extending the graph backwards.
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In what way does the change of resistance relate to the change of temperature for a moderate temperature range, and what term is used to represent this relationship?
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