Which row correctly identifies the charge carriers responsible for conduction in a metal wire and the direction of conventional current in a circuit?
| Charge carriers in a metal wire | Direction of conventional current | |
|---|---|---|
| A | Free electrons | From the positive terminal to the negative terminal |
| B | Free electrons | From the negative terminal to the positive terminal |
| C | Positive ions | From the positive terminal to the negative terminal |
| D | Positive ions | From the negative terminal to the positive terminal |
Row A
Row B
Row C
Row D
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.