Which row in the table correctly describes the energy transformation associated with electromotive force (e.m.f.) in a power supply, and the unit in which e.m.f. is measured?
| Energy transformation | Unit | |
|---|---|---|
| A | electrical energy to other forms | V\text{V}V |
| B | electrical energy to other forms | W\text{W}W |
| C | other forms of energy to electrical energy | V\text{V}V |
| D | other forms of energy to electrical energy | W\text{W}W |
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.