Which statement about direct current (d.c.) and alternating current (a.c.) is correct?
In a d.c. series circuit, the current decreases as it flows through each resistor.
In an a.c. circuit, the electric charge carriers drift continuously in one direction around the circuit.
In a d.c. circuit, the net flow of charge carriers is in one direction.
In an a.c. circuit, the magnitude of the current is constant over time.
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.