A student wishes to measure first the potential difference across a resistor, and then the electrical energy transferred per unit charge by a battery. She has the resistor, the battery, and some connecting wires. What else does she need?
a joulemeter and a voltmeter
an ammeter and a voltmeter
an ammeter only
a voltmeter only
55 exam-style questions on CIE IGCSE Physics 4.2.3a Electromotive force. Each one has a worked solution and a mark scheme showing where the marks go.