A 100% efficient step-up transformer has primary voltage VpV_{\text{p}}Vp and primary current IpI_{\text{p}}Ip.
Which row in the table correctly compares the secondary voltage with VpV_{\text{p}}Vp and the secondary current with IpI_{\text{p}}Ip?
| Secondary voltage | Secondary current | |
|---|---|---|
| A | greater than VpV_{\text{p}}Vp | greater than IpI_{\text{p}}Ip |
| B | greater than VpV_{\text{p}}Vp | less than IpI_{\text{p}}Ip |
| C | less than VpV_{\text{p}}Vp | greater than IpI_{\text{p}}Ip |
| D | less than VpV_{\text{p}}Vp | less than IpI_{\text{p}}Ip |
Row A
Row B
Row C
Row D
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.