Advertisements
Advertisements
Question
Give the role of each of the three terminals of a three way pin plug.
Advertisements
Solution
The earth pin being thicker can never enter live or neutral sockets thus a given electric appliance gets connected only in one proper electrical position, where the live wire, neutral and earthing are connected correctly.
The earth pins being longer, get connected to earth terminal first, thus ensuring that the user will not get an electric shock, because the current will melt the fuse in case the electrical appliance is short-circuited.
RELATED QUESTIONS
The diagram in Fig. shows a three pin plug. Label the three pins.
- Why is the top pin thicker and longer than the other two?
- Why are the pins splitted at the ends?
What purpose is served by the terminals of a three way pin plug? Draw a diagram and name the pins.
Draw a labelled diagram of a three pin socket.
The following diagram shows a three pin socket marked as 1, 2 and 3.
- Identify and write live (L) neutral (N) and earth (E) against the correct number.
- To which part of the appliance is the terminal 1 connected?
- To which wire joined to 2 or 3, is the fuse connected?
In following Figure shows two bulbs with switches and fuse connected to mains through a three pin socket by means of a three wires cable.
- Label each component - bulb, switch, fuse and socket.
- Name and state the colour of insulation of each wire 1, 2 and 3.
- How are the two bulbs joined: in series or in parallel?
Fig shows a three pin plug top. Label the three pins. Why is the top pin thicker and longer than the other two? Why are the pins splitted at the ends?
Name the markings of a three-pin plug. Give the colour codes of the connecting leads.
Draw diagram of a three pin socket outlet and state the connections made to them.
Draw a labelled diagram with necessary switch, regulator etc. to connect a bulb, a plug socket outlet and a fan with the mains. In what arrangement have you connected these to the mains?
