An experimenter wishes to measure the electric current flowing through a resistor and the potential difference (p.d.) across it. The experimenter already has a power supply, the resistor, and connecting wires. What additional measuring instruments are required?
an ammeter only
a voltmeter only
an ammeter and a voltmeter
an ammeter and an ohmmeter
17 exam-style questions on CIE IGCSE Physics 4.3.1a Circuit diagrams and circuit components. Each one has a worked solution and a mark scheme showing where the marks go.