Resistance

Question 1

Resistance

Answer 1

The resistance (R) of a conductor is the ratio of the p.d. across it to the current flowing through it
R = V / I

Question 2

Unit of Resistance

Answer 2

The unit of resistance is the ohm

Question 3

The Ohm

Answer 3

A conductor has a resistance of 1 ohm if the current through it is 1 ampere when the p.d. across it is 1 volt

Question 4

Resistivity

Answer 4

If a conductor of length l and cross-sectional area A has a resistance R, the constant ‘Rho’ is given by:
‘Rho’ = RA / l