Question 2
;
- State the effect of temperature rise on resistance of a conductor.
- (i) State ohms law
(ii) A 4.0 m long 16mm2 aluminium wire has a potential difference of 1.5V across it. If the resistivity of aluminium is 2.70 x 10-8 Ωm, calculate the current I flowing through the wire.
Observation
The expected answers were;
- Temperature rise in conductors leads to rise in resistance
- (i) Ohm’s law states that the current flowing through a metallic conductor (e.g. wire) is directly proprtional to the potential difference across its ends provided that temperature and other physical condidtions of the conductor are kept constant.
