Advertisements
Advertisements
Question
Nowadays MCBs are used in homes, for stop the current in the circuit which suddenly increases.
Solution
- Electrical appliances used in homes like geyser, heater, motor, oven, washing machine, etc. have high power consumption.
- If such appliances are connected simultaneously, a large amount of current flows in the circuit.
- This current may exceed permissible value and cause overloading.
Hence, nowadays MCBs are used in homes, to stop the current in the circuit which suddenly increases due to overloading.
APPEARS IN
RELATED QUESTIONS
Draw a schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a 5 Ω resistor, an 8 Ω resistor, and a 12 Ω resistor, and a plug key, all connected in series.
What do the following symbols mean in circuit diagrams?
Draw circuit symbols for
fixed resistance
Draw circuit symbols for variable resistance
Draw the labelled diagram of an electric circuit comprising of a cell, a resistance, an ammeter, a voltmeter and a closed switch (or closed plug key). Which of the two has a large resistance : an ammeter or a voltmeter?
Tell the odd one out. Give proper explanation.
Explain the construction and working of the following. Draw a neat diagram and label it.
Electric motor
How does the short circuit form? What is its effect?
Who will spend more electrical energy? 500 W TV Set in 30 mins, or 600 W heater in 20 mins?
Two tungsten bulbs of power 50 W and 60 W work on 220 V potential difference. If they are connected in parallel, how much current will flow in the main conductor?
The following figure shows the symbols for components used in the accompanying electrical circuit. Place them at proper places and complete the circuit.
Which law can you prove with the help of above circuit?
In an electric circuit, electron flow a from of point of ______ potential to the point of ______ potential.
Draw a neat diagram showing a closed electric circuit.
Explain the following:
Open circuit
In any electric circuit, when the switch is on and the current flows through it why do the wire, switches, bulb or devices become hot?
The unit of electrical power is _______.
Draw the circuit diagram for the series connection.
Rahul wants to make an electric circuit. He has a bulb, two wires, a safety pin, and a piece of copper. He does not have any electric cell or battery. Suddenly he gets some idea. He uses lemon instead of a battery and makes a circuit. Will the bulb glow?
In the circuit diagram below, 10 units of electric charge move past point x every second What is the current in the circuit ______.
In the circuit shown, which switches (L,M or N) must be closed to light up the bulb?
In a simple circuit, why does the bulb glow when you close the switch?
What is the role of the earth wire in domestic circuits?
Explain about domestic electric circuits. (circuit diagram not required)
In a circuit, if the key is in open (off) condition, then electricity will not flow.
In the following circuits (Figure), heat produced in the resistor or combination of resistors connected to a 12 V battery will be
![]() |
![]() |
![]() |
(i) | (ii) | (iii) |
In an electrical circuit two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be
A child has drawn the electric circuit to study Ohm’s law as shown in Figure. His teacher told that the circuit diagram needs correction. Study the circuit diagram and redraw it after making all corrections.
Choose the statement which is not correct in the case of an electric fuse.
Our body is a ________________ of electricity.
In an electric circuit a fuse is a _________ _______ to prevent possible fire.
The ______ is a species of fish that can give electric shocks of up to six hundred fifty watts of electricity.
In the following arrangement shown in Fig. 12.2, the bulb will not glow if the ends A and B are connected with
In which of the following circuits A, B, and C gave in Fig. 12.4, the cell will be used up very rapidly?
Write a short note on the different electrical circuits.