1 What are the units of the temperature coefficient of resistivity? 2 Using Equa

Question

1 What are the units of the temperature coefficient of resistivity? 2 Using Equation 6.4, if R/Ro is plotted against AT, what would be the slope of the line? 3 What is Joule Heat? Which would make a more effective heating element, one with low resistance or one with high resistance (assuming constant voltage)? Explain 5) What might happen to the resistance of a resistor if it had current passing through it for a long time? Explain. 6 What is the difference between a positive and negative temperature coefficient of resistiviy?

Explanation / Answer

1) unit of temperature coefficient of resistivity is /°C ( per degree Celsius)

2) R = Ro( 1+T) so th slope of the line will be .

3) when an electric current is passed through a conducting wire, the electrical energy gets converted into heat energy. This effect is called heating effect of current also knows as Joule heating.

4) heat (H) = (V²/R)t

So for constant voltage the one which has less resistance will produce more heat because heat is inversely proportional to the resistance.

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