Which row correctly describes the movement of free (delocalised) electrons and positive metal ions when an electric current conduction occurs through a metal wire?
Free electrons: drift through the wire; Positive metal ions: vibrate about fixed positions
Free electrons: vibrate about fixed positions; Positive metal ions: drift through the wire
Free electrons: drift through the wire; Positive metal ions: drift through the wire
Free electrons: vibrate about fixed positions; Positive metal ions: vibrate about fixed positions
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.