A mobile-phone charger includes a transformer. Figure 9.1 illustrates a basic transformer. The primary coil is linked to 240 V a.c., while the secondary coil delivers the output voltage.
(a)[1]
State the name of the material from which the core is made.
(b(i))[3]
Calculate the output voltage for the secondary coil.
(b(ii))[1]
State whether this transformer is step-up or step-down, and give a reason for your choice.
(c)[2]
Transformers can raise the voltage used to send electricity from power stations to towns. Describe the advantages of transmitting electricity at a high voltage.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “iron, or laminated iron” …