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What is a short circuit? - Science and Technology 1

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प्रश्न

What is a short circuit?

एका वाक्यात उत्तर
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उत्तर

Due to a fault in the equipment or if the plastic coating on the ‘live’ and the ‘neutral’ wires gives away the two wires come in contact with each other and a large current flows through it producing heat. This is known as short circuit.

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पाठ 4: Effects of electric current - Answer in one sentence.

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संबंधित प्रश्‍न

State four most common electrical appliances based on heating effect of electric current. Why do we use finely heated platinum wire in surgery?


An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 s.


An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.


Why is the tungsten used almost exclusively for filament of electric lamps?


How does the resistance of a wire vary with its area of cross-section?


Write Joule's law of heating.


What is nichrome? State its one use.


Give two reasons why nichrome alloy is used for making the heating elements of electrical appliances.


An electric kettle rated at 220 V, 2.2 kW, works for 3 hours. Find the energy consumed and the current drawn.


An electric fuse works on the:
(a) chemical effect of current
(b) magnetic effect of current
(c) lighting effect of current
(d) heating effect of current


The elements of electrical heating devices are usually made of:

(a) tungsten
(b) bronze
(c) nichrome
(d) argon


The heat produced in a wire of resistance 'x' when a current 'y' flows through it in time 'z' is given by:

(a) x2 × y × z
(bx × z × y2
(cy × z2 × x
(dy × z × 


Heat energy is being produced in a resistance in a circuit at the rate of 100 W. The current of 3 A is flowing in the circuit. What must be the value of the resistance?


Statement 1 : Electric current ( flow of electrons ) creates heat in the resistor.
Statement 2 : Heat in the resistor is created according to the rule of energy conservation.
Explain Statement 1 with the help of Statement 2.


Answer the following question.
Write the mathematical expression for Joule's law of heating.


Solve the following question.
Compute the heat generated while transferring 96000 coulombs of charge in two hours through a potential difference of 40 V.


What is overloading?


Write scientific reason.

A coil made up of alloy Nichrome is used in the electric heater cooker as a resistor.


Explain the importance/uses of fuse wire.


Heating effect of current is called ______


An electric bulb is connected to a 220 V generator. The current is 0.50 A. What is the power of the bulb?


Which of the following gases are filled in electric bulbs?


(a) Observe the diagram given below and state whether the bulb will glow or not when we switch on K.

(b) Is it safe to handle the bulb when the switch is OFF?

(c) Give a reason for your answer in (b).


Unscramble the following words:

SFEU


An MCB can be used instead of a fuse in an electrical circuit.


What are the uses of electromagnets?


Copper wire offers very little ______ and does not get heated up quickly.


Assertion: A current-carrying wire should be charged.
Reason: The current in a wire is due to the flow of free electrons in a definite direction.


Name a few appliances which work on the basis of the heating effect of current.


The following is not a safety device.


An electric fuse is a wire made up of a material having ______ melting point.


A fuse is used in an electric circuit to stop high currents flowing through the circuit.


Define the following:

Electrolyte


In which of the following applications of Iron, rusting will occur most? Support your answer with valid reason.

A B C D

An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?


When a current I flows through a wire of resistance R for time t then the electrical energy produced is given by ______.


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