An AC mains adapter contains a transformer.
The primary coil of the transformer has 800 turns and the secondary coil has 64 turns. The input voltage to the transformer is 240 V.
Calculate the output voltage.
Output voltage=...................................................... V \text{Output voltage} = \text{...................................................... V} Output voltage=...................................................... VState the name of the metal used to make the core of the transformer.
Explain why a transformer requires alternating current (a.c.) rather than direct current (d.c.) to operate.
275 exam-style questions on CIE IGCSE Physics 4.5 Electromagnetic effects, covering 4.5.1a Electromagnetic induction, 4.5.1b Direction of an induced e.m.f., 4.5.2 The a.c. generator, 4.5.3a Magnetic effect of a current and its applications, 4.5.3b Strength and direction of the field around wires and solenoids, 4.5.4a Force on a current-carrying conductor, 4.5.4b Force on beams of charged particles, 4.5.5 The d.c. motor, 4.5.6a Construction and operation of a transformer, 4.5.6b Turns ratio and current in a transformer, and 4.5.6c High-voltage transmission of electricity. Each one has a worked solution and a mark scheme showing where the marks go.