A transformer has 600 turns on the primary coil connected to the 240 V mains supply. There are two secondary coils to serve different parts of an electrical appliance. Secondary coil 1 has 3000 turns and secondary coil 2 has 30 turns.
Which row is correct?
p.d. across secondary coil 1 / Vp.d. across secondary coil 2 / VA121.2B120012C300012D120030 \begin{array}{|c|c|c|}\hline & \text{p.d. across secondary coil 1 / V} & \text{p.d. across secondary coil 2 / V}\\ \hline \text{A} & 12 & 1.2\\ \hline \text{B} & 1200 & 12\\ \hline \text{C} & 3000 & 12\\ \hline \text{D} & 1200 & 30\\ \hline \end{array} ABCDp.d. across secondary coil 1 / V12120030001200p.d. across secondary coil 2 / V1.2121230A
B
C
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.