A transformer has NpN_{\text{p}}Np turns in the primary coil and NsN_{\text{s}}Ns turns in the secondary coil.
Which row gives the values of NpN_{\text{p}}Np and NsN_{\text{s}}Ns for a transformer that steps down a voltage of 24,000 V24,000\text{ V}24,000 V to 240 V?
Np=50,000N_{\text{p}} = 50,000Np=50,000 and Ns=500N_{\text{s}} = 500Ns=500
Np=500N_{\text{p}} = 500Np=500 and Ns=50,000N_{\text{s}} = 50,000Ns=50,000
Np=50,000N_{\text{p}} = 50,000Np=50,000 and Ns=5,000N_{\text{s}} = 5,000Ns=5,000
Np=5,000N_{\text{p}} = 5,000Np=5,000 and Ns=50,000N_{\text{s}} = 50,000Ns=50,000
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.