Complete the following sentences:
(i) An electric current represents a flow of electrical __________ inside a metal wire.
(ii) The instrument connected in series to measure this current is called __________ .
(iii) The potential difference across a component can be measured by connecting __________ in parallel with the component.
A student connects a length of resistance wire in a simple series circuit. The current through the wire is 0.6 A0.6\text{ A}0.6 A and the potential difference across it is 13.2 V13.2\text{ V}13.2 V. Calculate the resistance of this wire and state the unit.
The wire in (b) is replaced by a shorter length of wire from the same reel. Without further calculation, state the effect this has on:
(i) the resistance of the wire,
(ii) the current in the new wire when the potential difference across it remains 13.2 V13.2\text{ V}13.2 V.
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.