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प्रश्न
How does the short circuit form?
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उत्तर
A short circuit occurs when the live and neutral wires come into contact due to damaged insulation or a fault in an appliance. This causes a large current to flow.
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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?
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 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 a proper explanation.
Explain the construction and working of the following. Draw a neat diagram and label it.
Electric motor
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?
Resistances R1, R2, R3 and R4 are connected as shown in the figure. S1 and S2 are two keys. Discuss the current flowing in the circuit in the following cases.
- Both S1 and S2 are closed.
- Both S1 and S2 are open.
- S1 is closed but S2 is open.
The accompanying figure shows some electrical appliances connected in a circuit in a house. Answer the following questions.
- By which method are the appliances connected?
- What must be the potential difference across individual appliances?
- Will the current passing through each appliance be the same? Justify your answer.
- Why are the domestic appliances connected in this way?
- If the T.V. stops working, will the other appliances also stop working? Explain your answer.
Write the condition required for a circuit to be a closed circuit.
Match the column ‘A’ with column ‘B’.
|
Column ‘A’
|
Column ‘B’ |
|
(1) Eka - boron
|
(a) Germanium
|
|
(2) Eka - Aluminium
|
(b) Scandium
|
|
(3) Eka - Silicon
|
(c) Gallium |
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
What do you understand by the open electric circuit?
The unit of electrical power is _______.
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.
Draw the circuit diagram for the series connection.
In the circuit shown, which switches (L,M or N) must be closed to light up the bulb?
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?
Assertion: People struck by lightning receive a severe electrical shock.
Reason: Lightning carries very high voltage.
When a circuit is open, _____ cannot pass through it.
Explain about domestic electric circuits. (circuit diagram not required)
Instead of metal wires, a jute string can be used to make a circuit.
Draw a circuit diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of 2 Ω in series with a combination of two resistors (4 Ω each) in parallel and a voltmeter across the parallel combination. Will the potential difference across the 2 Ω resistor be the same as that across the parallel combination of 4 Ω resistors? Give reason.
In an electric circuit a fuse is a ______ ______ to prevent possible fire.
Draw the symbols of the following circuit components.
Switch in off position
Boojho has a cell and a single piece of connecting wire. Without cutting the wire in two, will he be able to make the bulb glow? Explain with the help of a circuit diagram.
Overloading of electric circuits can lead to short-circuiting.
How is Joule's law effect useful in electric circuits where fuse is used as a safety device?
