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4.5 Electromagnetic effects

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Question 43

An ideal transformer (100% efficient) has N1 N_1\,N1​ turns on its primary coil and N2 N_2\,N2​ turns on its secondary coil. The voltages across the primary and secondary coils are V1 V_1\,V1​ and V2 V_2\,V2​ respectively, and the currents are I1 I_1\,I1​ and I2I_2I2​.

Which pair of equations is valid for this transformer?

A

V1I2=V2I1V_1 I_2 = V_2 I_1V1​I2​=V2​I1​ and V1V2=N2N1\frac{V_1}{V_2} = \frac{N_2}{N_1}V2​V1​​=N1​N2​​

B

V1I1=V2I2V_1 I_1 = V_2 I_2V1​I1​=V2​I2​ and V1V2=N1N2\frac{V_1}{V_2} = \frac{N_1}{N_2}V2​V1​​=N2​N1​​

C

V1I2=V2I1V_1 I_2 = V_2 I_1V1​I2​=V2​I1​ and V1V2=N1N2\frac{V_1}{V_2} = \frac{N_1}{N_2}V2​V1​​=N2​N1​​

D

V1I1=V2I2V_1 I_1 = V_2 I_2V1​I1​=V2​I2​ and V1V2=N2N1\frac{V_1}{V_2} = \frac{N_2}{N_1}V2​V1​​=N1​N2​​

Markscheme

4.5 Electromagnetic effects Questions

  1. IGCSE
  2. /Physics
  3. /4.5 Electromagnetic effects

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.

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