A power circuit uses a cable having three different wires.

(a) Name the three wires of the cable.

(b) Between which of the two wires should the heating element of an electric geyser be connected?

(c) To which wire should the metal case of the geyser be connected?

(d) To which wire should the switch and fuse be connected?

State two circumstances when one may get an electric shock from an electric gadget. What preventive measures must be provided with the gadget to avoid it?

The figure below shows a dual control switch circuit use to light a bulb.

(i) Complete the circuit so that bulb is switched on.

(ii) Mark the supply terminals with L and N to indicate live and neutral wires.

Figure below shows two bulbs with switches and fuse connected to the mains through a three pin socket by means of a three wires cable.

(a) Label each component — bulb, switch, fuse and socket.

(b) Name and state the colour of insulation of each wire 1, 2 and 3.

(c) How are the two bulbs joined : in series or in parallel.