CAPE Physics Unit 2 · 2007 · Paper 1 · Question Q19

An ideal transformer has N_s turns in its secondary coil and N_p turns in its primary coil. The alternating voltages in the secondary and primary coils are V_s and V_p respectively and the alternating currents in the secondary and primary coils are I_s and I_p respectively. Which of the following relationships is correct?

1. (A)\frac{N_s}{N_p} = \frac{V_s}{V_p} = \frac{I_p}{I_s}
2. (B)\frac{N_s}{N_p} = \frac{V_p}{V_s} = \frac{I_p}{I_s}
3. (C)\frac{N_s}{N_p} = \frac{V_s}{V_p} = \frac{I_s}{I_p}
4. (D)\frac{N_s}{N_p} = \frac{V_p}{V_s} = \frac{I_s}{I_p}