Two ideal transformers, T1 T_1\,T1 and T2T_2T2, are connected in series. Transformer T1 T_1\,T1 has 1500 turns on its primary coil and 500 turns on its secondary coil. Transformer T2 T_2\,T2 has 1200 turns on its primary coil and 300 turns on its secondary coil.
The secondary coil of T1 T_1\,T1 is connected directly to the primary coil of T2T_2T2.
If transformer T2 T_2\,T2 delivers a current of 3.6 A to a motorized load, what is the current being supplied to the primary coil of transformer T1T_1T1?
2.7 A2.7\text{ A}2.7 A
0.9 A0.9\text{ A}0.9 A
0.3 A0.3\text{ A}0.3 A
0.1 A0.1\text{ A}0.1 A
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.