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

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.

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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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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
2018-2019 (March) Balbharati Model Question Paper Set 1

संबंधित प्रश्‍न

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


Write Joule's law of heating.


Why are the coils of electric irons and electric toasters made of an alloy rather than a pure metal?


Why is a series arrangement not used for connecting domestic electrical appliances in a circuit?


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


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


If the current flowing through a fixed resistor is halved, the heat produced in it will become:


Give a scientific reason:

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


Identify the figure and give its use.


Why does tungsten metal used to make solenoid type coil in an electric bulb?


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


In an electric bulb, coil of _______ metal is used.


The electricity bill specifies the usage in _______.


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


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


When does overloading occur?


What does overloading cause?


Name any two appliances which work under the principle of heating effect of current.


Which of the following is correct?


Mark the correct choice

  1. Assertion: Electric appliances with a metallic body have three wire connections.
  2. Reason: Three-pin connections reduce the heating of the connecting wires.

An electric iron consumes energy at the rate of 420 W when heating is at the maximum rate and 180 W when heating is at the minimum rate. The applied voltage is 220 V. What is the current in each case?


A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross-section of the filament in 16 seconds would be roughly:


The heating element of an electric iron is made up of:


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?


How does use of a fuse wire protect electrical appliances?


B1, B2 and B3 are three identical bulbs connected as shown in Figure. When all the three bulbs glow, a current of 3A is recorded by the ammeter A.

  1.  What happens to the glow of the other two bulbs when the bulb B1 gets fused?
  2. What happens to the reading of A1, A2, A3 and A when the bulb B2 gets fused?
  3. How much power is dissipated in the circuit when all the three bulbs glow together?

 


An electric component used as a safety device is electric circuit is ______.


When a switch is in OFF position,

  1. circuit starting from the positive terminal of the cell stops at the switch.
  2. circuit is open.
  3. no current flows through it.
  4. current flows after some time. 

Choose the combination of correct answer from the following.


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


Your teacher has shown you the following activity.


Activity: Teacher has wound a long insulated piece of wire around an iron nail in the form of a coil. Free ends of the wire are connected to a cell through a switch as shown in the following figure. The current is switched on and some pins are placed near the ends of the nail.

Write down any three questions that come to your mind about this activity.


What is an electric fuse made up of?


Explain the working of an electric fuse.


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.


What is a trip switch?


An electrochemical cell converts ______ energy into ______ energy.


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?


Find the odd one out.


Write an expression for the amount of heat produced in a resistor when an electric current is passed through it stating the meanings of the symbols used.


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