Fig. 10.1 depicts a transformer made up of two coils P and Q, together with an iron core. Coil P has 200 turns and coil Q has 340 turns. A $4.0\,\text{V}$ a.c. power supply is connected to coil P.
(a(i))[3]
Explain why a voltage exists between the two terminals of coil Q.
(a(ii))[1]
Explain why the transformer core is made from soft iron.
(b(i))[2]
Calculate the p.d. between the two terminals of coil Q.
(b(ii))[2]
Calculate the current in coil P.
(c)[2]
A transformer is used to step up the voltage before electrical energy is transmitted over long distances. State and explain one economic consequence of transmitting electrical energy at a high voltage.
Worked solution & mark scheme
This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “magnetic field present” …