Fig. 10.1 illustrates the suggested arrangement for charging the battery in an electric toothbrush. The toothbrush handle houses the battery and a coil X. The connection between coil X and the battery is not shown. Inside the charger base is a coil Y, wrapped around an iron core and linked to the a.c. mains supply. To recharge the battery, the handle is lowered until coil Y lies inside coil X. Fig. 10.1 indicates the required direction of the charging current at the battery.
(a(i))[1]
Draw the circuit symbol used for a diode.
(a(ii))[1]
State what a diode does.
(b(i))[2]
On Fig. 10.1, finish the circuit from terminals A and B of coil X to the battery, and include a diode.
(b(ii))[3]
Explain how an alternating voltage is generated in coil X.
Worked solution & mark scheme
This 7-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Diode symbol drawn correctly” …