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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. - Science and Technology 1

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प्रश्न

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.

उत्तर

i. When electrons flows through the resistor (during flowing electric current) electron possesses kinetic energy.
ii. During the flow of electron there is decrease in kinetic energy of electrons due to collision on atoms, ions and molecules. 
iii. According to the law of conservation of energy decrease in kinetic energy gets converted into heat.

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2018-2019 (March) Balbharati Model Question Paper Set 1

संबंधित प्रश्न

Compute the heat generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V.


How does the resistance of a wire vary with its: 

 diameter? 

 


Why does the connecting cord of an electric heater not glow hot while the heating element does?


Explain why, tungsten is used for making the filaments of electric bulbs.


 How much heat will an instrument of 12 W produce in one minute if it is connected to the heat produced by it?  


The current passing through a room heater has been halved. What will happen to the heat produced by it?


The current passing through an electric kettle has been doubled. The heat produced will become:

(a) half
(b) double
(c) four time
(d) one-fourth 


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 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 of the following characteristic is not suitable for a fuse wire?

(a) thin and short
(b) thick and short
(c) low melting point
(d) higher resistance than rest of wiring


How does the wire in the filament of a light bulb behave differently to the other wires in the circuit when the current flows?

What property of the filament wire accounts for this difference?


An electric iron is connected to the mains power supply of 220 V. When the electric iron is adjusted at 'minimum heating' it consumes a power of 360 W but at 'maximum heating' it takes a power of 840 W. Calculate the current and resistance in each case. 


Give a scientific reason.

Tungsten metal is used to make a solenoid type coil in an electric bulb.


Name the factors on which the heat produced in a wire depends when current is passed in it, and state how does it depend on the factors stated by you.


Rewrite the following statement by selecting the correct option:

1 A = ____________ mA.


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


These days when current in the circuit suddenly increases _______ switches are used.


What is overloading?


Write two devices based on the heating effect of electric current.


Live wire and neutral wires have a 220 V potential difference.


Write scientific reason.

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


What does overloading cause?


Explain the application of heating effect of electric current in an electric bulb with a diagram.


Name some devices that run using heat effect of electric current


Explain the heating effect of electric current.


A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of:


Which of the following gases are filled in electric bulbs?


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?


An electric fuse has a body made of ceramic and two points for connecting the fuse wire.


What are the uses of electromagnets?


What are the factors affecting heating effect of electric current?


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


Fuse is a strip of alloy wire which is made up of lead and tin with a very low ______.


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


If 220 V potential difference is applied across an electric bulb, a current of 0.45 A flows in the bulb. What must be the power of the bulb?


State the law that explains the heating effect of current with respect to the measurable properties in an electrical circuit.


Anannya responded to the question: Why do electrical appliances with metallic bodies are connected to the mains through a three-pin plug, whereas an electric bulb can be connected with a two-pin plug?

She wrote: Three-pin connections reduce heating of connecting wires.

  1. Is her answer correct or incorrect? Justify.
  2. What is the function of a fuse in a domestic circuit?

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