In an experiment, a student uses an electrical heater connected to a power supply.
The current in the electrical heater is 2.5 A2.5\text{ A}2.5 A. The voltage (p.d.) across the heater is 24 V24\text{ V}24 V.
Calculate the energy transferred to the heater in 150 s150\text{ s}150 s.
energy transferred=........................... J \text{energy transferred} = ...........................\text{ J} energy transferred=........................... JThe power supply is connected to the electrical mains by a cable that consists of three wires.
State the name for each of the three wires in the cable.
The power supply includes a transformer.
The voltage (VpV_\text{p}Vp) across the primary coil of the transformer is 240 V240\text{ V}240 V. The voltage (VsV_\text{s}Vs) across the secondary coil of the transformer is 18 V18\text{ V}18 V. The number of turns on the primary coil (NpN_\text{p}Np) is 800800800.
Calculate the number of turns (NsN_\text{s}Ns) on the secondary coil.
number of turns on secondary coil=........................... \text{number of turns on secondary coil} = ........................... number of turns on secondary coil=...........................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.