Resistance Flashcards
1
Q
Resistance
A
The resistance (R) of a conductor is the ratio of the p.d. across it to the current flowing through it R = V / I
2
Q
Unit of Resistance
A
The unit of resistance is the ohm
3
Q
The Ohm
A
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
4
Q
Resistivity
A
If a conductor of length l and cross-sectional area A has a resistance R, the constant ‘Rho’ is given by:
‘Rho’ = RA / l
