The resistance of a 1.0 m1.0\text{ m}1.0 m length of resistance wire is 8.0 Ω8.0\ \Omega8.0 Ω. Under experimental conditions, a crocodile clip is connected to one end of the wire at the 0 m0\text{ m}0 m mark of a metre rule. A movable contact can touch the wire at any position along its length lll from the 0 m0\text{ m}0 m mark.
Describe the expected orientation and shape of a graph showing how the resistance RRR of the wire varies with length lll as lll increases from 000 to 1.0 m1.0\text{ m}1.0 m. State the coordinates of the endpoints of this graph.
A battery of electromotive force (e.m.f.) 12 V12\text{ V}12 V with negligible internal resistance is connected across the entire 1.0 m1.0\text{ m}1.0 m length of the resistance wire.
State what is meant by electromotive force (e.m.f.).
A battery of electromotive force (e.m.f.) 12 V12\text{ V}12 V with negligible internal resistance is connected across the entire 1.0 m1.0\text{ m}1.0 m length of the resistance wire.
Calculate the current in the resistance wire.
A battery of electromotive force (e.m.f.) 12 V12\text{ V}12 V with negligible internal resistance is connected across the entire 1.0 m1.0\text{ m}1.0 m length of the resistance wire.
Calculate the potential difference (p.d.) across a length l=0.45 ml = 0.45\text{ m}l=0.45 m of the wire.
A battery of electromotive force (e.m.f.) 12 V12\text{ V}12 V with negligible internal resistance is connected across the entire 1.0 m1.0\text{ m}1.0 m length of the resistance wire.
Calculate the charge that passes through the resistance wire in 6.5 minutes6.5\text{ minutes}6.5 minutes.
132 exam-style questions on CIE IGCSE Physics 4.2.4a Resistance. Each one has a worked solution and a mark scheme showing where the marks go.