In a circuit, two identical heaters are connected in parallel. This parallel pair is connected in series with a resistor and a battery.
The battery does 240 J240\text{ J}240 J of work moving 60 C60\text{ C}60 C of charge around the circuit in time ttt.
In each heater, 90 J90\text{ J}90 J of work is done by the charge that passes through it in time ttt.
The electromotive force (e.m.f.) of the battery is EEE and the potential difference (p.d.) across one heater is VVV.
What are the values of EEE and VVV?
452 exam-style questions on CIE IGCSE Physics 4.2 Electrical quantities, covering 4.2.1a Positive and negative charge, 4.2.1b Charging by friction and detecting charge, 4.2.1c Electrical conductors and insulators, 4.2.1d Electric fields and electric field patterns, 4.2.2a Electric current, charge and measuring current, 4.2.2b Conduction in metals and the direction of current, 4.2.2c Direct current and alternating current, 4.2.3a Electromotive force, 4.2.3b Potential difference and voltmeters, 4.2.4a Resistance, 4.2.4b Resistance of a metallic wire, 4.2.4c Current–voltage graphs, and 4.2.5 Electrical energy and electrical power. Each one has a worked solution and a mark scheme showing where the marks go.