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प्रश्न
How does the short circuit form? What is its effect?
उत्तर
- The household electrical connections mainly consist of live, neutral and earth wires.
- The potential difference between live and neutral wires is around 220 V.
- Sometimes, due to fault in the electrical appliances or damage of the insulating coating around the two wires i.e., neutral and live, the two wires come in contact with each other and large current flows through them causing short circuit.
- Large amount of heat is produced due to flow of this large current. Any inflammable material like wood, plastic, cloth, etc. present around the short-circuited place can catch fire.
संबंधित प्रश्न
Redraw the circuit of question 1, putting in an ammeter to measure the current through the resistors and a voltmeter to measure the potential difference across the 12 Ω resistors. What would be the readings in the ammeter and the voltmeter?
Draw circuit symbols for
fixed resistance
Draw circuit symbols for
a cell
Draw circuit symbols for
A closed 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.
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?
Distinguish between a closed circuit and an open circuit, with the use of suitable labelled diagrams.
Write the condition required for a circuit to be a closed circuit.
Name the instrument used to control current in an electric 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?
Find the odd one out and give its explanation.
How much is the potential difference between live and neutral wires?
Increasing the current passing through the wire decreases the magnetic field intensity.
______ is the device used to close or open an electric circuit.
______ is the device used to close or open an electric circuit.
In the given circuit diagram, which of the given switch(s) should be closed. So that only bulb A glows.
Tabulate the different components of an electric circuit and their respective symbols.
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?
Assertion: People struck by lightning receive a severe electrical shock.
Reason: Lightning carries very high voltage.
State whether true or false. If false, correct the statement.
Ammeter is connected in parallel in any electric circuit.
In a simple circuit, why does the bulb glow when you close the switch?
The wiring in a house consists of ______ circuits.
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) |
Three bulbs A, B, and C are connected in a circuit as shown in Figure 14.2. When the switch is ‘ON’
In the above circuit, if the current reading in the ammeter A is 2A, what would be the value of R1?
The ______ is a species of fish that can give electric shocks of up to six hundred fifty watts of electricity.
Match the following
| 1. | Insulator | a. | Coulomb |
| 2. | Conductor | b. | Electric circuit |
| 3. | Closed path | c. | Copper |
| 4. | Electric charge | d. | Rubber |
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
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?
