During a test of an experimental ion-thruster ignition system for a deep-space probe, a micro-heating filament is used to pre-heat the propellant gas. The filament is designed to operate with a stable potential difference of 48.0 V48.0\text{ V}48.0 V across its terminals. During steady-state operation, the mean electrical power dissipated by the filament is measured to be 7.20 W7.20\text{ W}7.20 W.
Calculate the electrical resistance of the micro-heating filament.
39 exam-style questions on AQA GCSE Physics 2.1 Current, potential difference and resistance, covering 2.1.1 Standard circuit diagram symbols, 2.1.2 Electrical charge and current, 2.1.3 Current, resistance and potential difference, and 2.1.4 Resistors. Each one has a worked solution and a mark scheme showing where the marks go.