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प्रश्न
Nowadays MCBs are used in homes, for stop the current in the circuit which suddenly increases.
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उत्तर
- 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.
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संबंधित प्रश्न
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 variable resistance
Draw circuit symbols for
a battery of three cells
Draw circuit symbols for
an open switch
Explain with the help of a labelled circuit diagram how you will find the resistance of a combination of three resistors, or resistance R1, R2 and R3, joined in parallel. Also mention how you will connect the ammeter and the voltmeter in the circuit when measuring the current in the circuit and the potential difference across one of the three resistors of the combination.
How does the short circuit form?
Find the odd one out and justify it.
Fuse wire, M.C.B., Rubber Gloves, Generator
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.
In an electric circuit, a battery and a bulb have been connected and the battery consists of two cells of equal potential difference. If the bulb is not glowing, then which tests will you perform in order to find out the reason for the bulb not glowing?
Answer the following question.
With the help of a suitable circuit diagram prove that the reciprocal of the equivalent resistance of a group of resistances joined in parallel is equal to the sum of the reciprocals of the individual resistances.
What do you understand by the closed electric circuit
Name the instrument used to control current in an electric circuit.
Explain the following:
Open circuit
What is 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?
If you touch an electric wire carrying current you get a shock, but if on the same wire the birds sit they do not get any shock/current. Explain why?
How much is the potential difference between live and neutral wires?
Write scientific reason.
It is beneficial to carry electrical energy in AC form as it is carried over long distances.
______ is the device used to close or open an electric circuit.
______ is the device used to close or open an electric circuit.
Higher Order Question
A student made a circuit by using an electric cell, a switch, a torch bulb (fitted in the bulb holder), and copper connecting wires. When he turned on the switch, the torch bulb did not glow at all. The student checked the circuit and found that all the wire connections were tight.
- What could be the possible reason for the torch bulb not glowing even when the circuit appears to be complete?
Which of the following a simple circuit must-have?
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
 |
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| (i) | (ii) | (iii) |
In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?
In an electric circuit, the current starts from ______.
Observe the circuit given:
1. Would any of the bulbs glow when the switch is in the ‘OFF’ position?
2. What will be the order in which the bulbs A, B, and C will glow when the switch is moved to the ‘ON’ position?
In the above circuit, if the current reading in the ammeter A is 2A, what would be the value of R1?
What are the essential components of an electric circuit?
Paheli is running short of connecting wires. To complete an electric circuit, she may use a ______.
Paheli connected two bulbs to a cell as shown in the following figure.
She found that filament of bulb B is broken. Will the bulb A glow in this circuit? Give reason.
Name the device which is used to measure the strength of the electric current in an electric circuit.
Set up the circuit shown in Figure again. Move the key to ‘ON’ position and watch carefully in which direction the compass needle gets deflected. Switch ‘OFF’ the current. Now keeping rest of the circuit intact, reverse the connections at the terminal of the cell. Again switch ‘on’ the current. Note the direction in which the needle gets deflected. Think of an explanation.
