A transformer has 120 turns on its primary coil and 40 turns on its secondary coil. An alternating voltage of 240 V is connected across the primary coil.
What is the voltage across the secondary coil?
20.0 V20.0\text{ V}20.0 V
80.0 V80.0\text{ V}80.0 V
120 V120\text{ V}120 V
720 V720\text{ V}720 V
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.