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.