Advertisements
Advertisements
Question
What is meant by ‘MCB’? Which part of the domestic electric circuit does it replace?
Advertisements
Solution
‘MCB’ stands for ‘miniature circuit breaker’. This is a device that automatically ‘switches off the mains supply if the current drawn Exceeds the prescribed upper safe limit. It can be ‘reset’ with the help of a flip-over switch. It protects the entire circuit and appliances against short circuiting, etc.
RELATED QUESTIONS
The following diagram shows three lamps and three switches 1, 2 and 3 connected with two cells.
- Name the switch / switches to be closed so as to light all the three lamps.
- How are the lamps connected: in series or in parallel?
It is dangerous to connect the switch in the neutral wire. Explain your answer.
A switch must be connected in the ______.
Complete the drawing shown in Figure to indicate where the free ends of the two wires should be joined to make the bulb glow.
What is the purpose of using an electric switch? Name some electrical gadgets that have switches built into them.
Would the bulb glow after completing the circuit shown in Figure if instead of a safety pin we use an eraser?
In which position is the key placed in a circuit?
Name the component of a circuit which help us to start or stop the appliances & safely and easily.
What precaution do you take while handling a switch?
Name the wire to which a switch is connected.
