
At room temperature , the resistance of a heating element is . What is the temperature of the element if the resistance is found to be given that the temperature coefficient of the material of resistance is .
Important Questions on Current Electricity
and are respectively the current and voltage in a metal wire of resistance The graph for the two different temperatures and are given, then













When the temperature of a conductor increases, the ratio of conductivity and resistivity _____


Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Alloys such as constantan and manganin are used in making standard resistance coils.
Reason R: Constantan and manganin have very small value of temperature coefficient of resistance.
In the light of the above statements, choose the correct answer from the options given below.



In an experiment, the resistance of a material is plotted as a function of temperature (in some range). As shown in the figure, it is a straight line.
One may conclude that


