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Name any two appliances which works on the phenomenon of heating effect of electric current.

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प्रश्न

Name any two appliances which works on the phenomenon of heating effect of electric current.

एक पंक्ति में उत्तर
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उत्तर

Fuse wire, electric iron, electric bulb, electric cooker, geyser.

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अध्याय 4: Effects of electric current - Solve the following Questions

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संबंधित प्रश्न

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


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: 

 diameter? 

 


An electric iron of resistance 20 ohms draws a current of 5 amperes. Calculate the heat produced in 30 seconds.


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


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


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


Two exactly similar heating resistances are connected (i) in series, and (ii) in parallel, in two different circuits, one by one. If the same current is passed through both the combinations, is more heat obtained per minute when they are connected in series or when they are connected in parallel? Give reason for your answer.


Give a scientific reason.

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


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.


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.


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


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


Which of the following substance contracts on heating?


How can overloading be avoided?


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


Define fuse.


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:


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


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.


Three incandescent bulbs of 100 W each are connected in series in an electric circuit. In another circuit another set of three bulbs of the same wattage are connected in parallel to the same source.

  1. Will the bulb in the two circuits glow with the same brightness? Justify your answer.
  2. Now let one bulb in both the circuits get fused. Will the rest of the bulbs continue to glow in each circuit? Give reason.

Unscramble the following words:

SFEU


Name two electric devices for each where

  1. heating effect of current is used and
  2. magnetic effect of current is used.

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


What are the uses of electromagnets?


What are the factors affecting heating effect of electric current?


Explain the working of an electric fuse.


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.


An electrochemical cell converts ______ energy into ______ energy.


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


The electric fuse works on the Joule heating principle.


Find the odd one out.


1 kWh is equal to ______.


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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