Advertisements
Advertisements
Question
How does the short circuit form? What is its effect?
Advertisements
Solution
- 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.
RELATED QUESTIONS
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
Tell the odd one out. Give proper explanation.
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 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.
Distinguish between a closed circuit and an open circuit, with the use of suitable labelled diagrams.
What do you understand by the closed electric circuit
Name the instrument used to control current in an electric circuit.
The unit of electrical power is _______.
Nowadays MCBs are used in homes, for stop the current in the circuit which suddenly increases.
Write scientific reason.
It is beneficial to carry electrical energy in AC form as it is carried over long distances.
Flow of electricity through a closed circuit is _____.
______ is the device used to close or open an electric circuit.
______ 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?

In which of the following circuits are the bulb connected in series?
Draw the circuit diagram for the following series connection

Study the electric circuit below. Which of the following switches should be closed so that only two bulbs will light up

Study the three electric circuits below. Each of them has a glass rod (G), a steel rod (S), and a wooden rod (W).
In which of the electric circuits would the bulb not light up.

Fuse is
When a circuit is open, _____ cannot pass through it.
What is the role of the earth wire in domestic circuits?
The rate of flow of electric charges in a circuit is called ______.
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
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.
Choose the statement which is not correct in the case of an electric fuse.
Draw the symbols of the following circuit components.
Switch in off position
The ______ is a species of fish that can give electric shocks of up to six hundred fifty watts of electricity.
Paheli is running short of connecting wires. To complete an electric circuit, she may use a ______.
Will the bulb glow in the circuit shown in the following figure? Explain.

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.
Name the device which is used to measure the strength of the electric current in an electric circuit.
How is Joule's law effect useful in electric circuits where fuse is used as a safety device?
