Verification of Ohm's Law
1)Ohm's law :

2)A rheostat is a _ ?

3)A potential difference of 10V appears across the ends of a resistor when 5A of current flows through it. The resistance of the resistor is :

4)The S.I. unit of resistance is :

5)The graph of current I (on y-axis) Vs. potential difference V (on x-axis) is found to be a straight line. The slope of the straight line gives :