alternator arc blow capacitor cathode cell charge(n) charge(v) charger circuit circuit board circuit breaker circuitry coil condenser connection contact cord cordless current DC dimmer direct current discharge(v) discharge(n) E earth(n) earth(v) electric electrical electrician electricity electrics electrode electronic electronics fuel cell fuse fuse box fused grid live live wire magic eye magneto negative neutral noise oscillate oscillator outlet photoelectric photoelectric cell pin plug point pre-set printed circuit programme(n) programme(v) pulse remote control resistance resistor scan scanner short(n) short(v) short circuit short-circuit socket solid-state sonar superconductivity superconductor terminal time switch toggle switch torch transformer transistor vacuum tube valve W wire wiring zapper