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महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (इंग्रजी माध्यम) इयत्ता १० वी

What is a short circuit?

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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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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 4: Effects of electric current - Answer in one sentence. [पृष्ठ १३]

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एससीईआरटी महाराष्ट्र Science and Technology Part 1 [English] Standard 10 Maharashtra State Board
पाठ 4 Effects of electric current
Answer in one sentence. | Q 3. | पृष्ठ १३

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?


Name any two effects of electric current.


When current is switched ‘on’ in a room heater, it ______.


An electric heater is connected to the 230 V mains supply. A current of 8 A flows through the heater.

  1. How much charge flows around the circuit each second?
  2. How much energy is transferred to the heater each second?

How does the resistance of a wire vary with its: 

 diameter? 

 


A heating coil has a resistance of 200 Ω. At what rate will heat be produced in it when a current of 2.5 A flows through it?


A resistance of 25 Ω is connected to a 12 V battery. Calculate the heat energy in joules generated per minute.


Name the material which is used for making the filaments of an electric bulb.


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 × 


Which electric heating device in your home do you think have resistors which control the flow of electricity?


Give a scientific reason:

For electric power transmission, copper or aluminium wire is used.


Identify the figure and give its use.


Give scientific reason :
In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster, etc., an alloy such as Nichrome is used, not pure metals.


The ‘live’ and the ‘neutral’ wires have potential difference of _______.


A coil of an alloy _______ is used in electric heater cooker as a resistor.


Which metal is used to make the filament of an electric bulb?


What is overloading?


Explain the importance/uses of fuse wire.


When does overloading occur?


True or False – If False give the correct answer

The fuse wire does not melts whenever there is overload in the wiring.


Which of the following gases are filled in electric bulbs?


Assertion: Bending of wire decreases the resistance of the electric wire.

Reason: The resistance of a conductor depends on length, thickness, nature of material and temperature of the conductor.


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?


What is Joule’s heating effect? How can it be demonstrated experimentally? List its four applications in daily life.


(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).


An electric cell produces electricity from the ______ ______ in it.


What is an electric fuse made up of?


What are the factors affecting heating effect of electric current?


It would cost a man Rs. 3.50 to buy 1.0 kW h of electrical energy from the Main Electricity Board. His generator has a maximum power of 2.0 kW. The generator produces energy at this maximum power for 3 hours. Calculate how much it would cost to buy the same amount of energy from the Main Electricity Board.


Match the following

1. Bulb a. Conductor
2. Electroplating b.

Insulator

3. Pure water c.  Heating effect of current
4. Salt solution d. Chemical effect of current

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


An electrochemical cell converts ______ energy into ______ energy.


In the electric equipment producing heat like iron, electric heater, boiler, toaster etc., an alloy such as nichrome is used, not pure metals.


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?


What is the heating effect of electric current?


The graph of voltage vs current for four different materials is shown below.

Which of these four materials would be used for making filament of bulb?


An electric iron is rated 220 V, 2 kW. If the iron is used for 3h daily find the cost of running it for one week if it costs ₹ 4.25 per kWh.


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