मराठी

Name the Material Which is Used for Making the Heating Element of an Electric Iron.

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प्रश्न

Name the material which is used for making the heating element of an electric iron.

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उत्तर

The coils of the heating element of an electric iron is made of alloys like nichrome because alloys have a high resistance and a high melting point.

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पाठ 4: Electricity - Exercise 4 [पृष्ठ २१३]

APPEARS IN

लखमीर सिंह Physics Part 1 [English] Class 10
पाठ 4 Electricity
Exercise 4 | Q 7. | पृष्ठ २१३

संबंधित प्रश्‍न

Find the expression for resistors connected in series.


Why is the series arrangement not used for domestic circuits?


(i) Two sets A and B, of three bulbs each, are glowing in two separate rooms. When one of the bulbs in set A is fused, the other two bulbs also cease to glow. But in set B, when one bulb fuses, the other two bulbs continue to glow. Explain why this phenomenon occurs.

(ii) Why do we prefer arrangements of Set B for house circuiting?


How does the resistance of a pure metal change if its temperature decreases?


How does the resistance of a wire change when: 

 its length is tripled? 


How does the resistance of a wire change when:

 its diameter is tripled? 

 


Give the law of combination of resistances in series.


In series combination of resistances ______.


The potential difference between the terminals of an electric iron is 240 V and the current flowing through it is 6 A. What is the resistance of the electric iron?

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(a) the resistance of the appliance and

(b) the safe limit of the current in it, while in use?


Choose the correct alternative and rewrite the following sentence.

If three resistors 2 ohms, 3 ohms and 4 ohms are connected in series, then the effective resistance in the circuit will be _______ ohms.


Choose the correct alternative and rewrite the following:

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Answer the following question.
While studying the dependence of potential difference ( V) across a resistor on the current (I) passing through it, in order to determine the resistance of the resistor, a student took 5 readings for different values of current and plotted a graph between V and t. He got a straight line graph passing through the origin. What does the straight-line signify? Write the method of determining the resistance of the resister using this graph. 


State the effect of rise in temperature on the resistance of semi-conductors.


State a relation between electrical power, resistance and potential difference in an electrical circuit.


State and explain the laws of resistance.


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Draw a labelled circuit diagram showing the above arrangement.


What should be the length of a nickel wire of area of cross-section 3 mm2 used for making a rheostat of 750 ohm? (ρ of nickle = 0.069 Ohm mm2/m)


Calculate the quantity of heat that will be produced in a coil of resistance 75 Ω if a current of 2A is passed through it for 2 minutes.


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