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    why nichrome is used as heating element

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    Why is nichrome wire generally used as a heating element in heating appliances? Give any three reasons.

    Why is nichrome wire generally used as a heating element in heating appliances? Give any three reasons.

    Byju's Answer Standard VI Mathematics Proportions Why is nichro... Question

    Why is nichrome wire generally used as a heating element in heating appliances? Give any three reasons.

    Open in App Solution

    According to Joule's heating effect, the equation for the heat energy produced in the conductor is

    H=I2Rt , where H

    is heat energy produced,

    I

    is the current in the circuit,

    t

    is the time for which current flows a circuit and

    R is the resistance.

    As the resistance increases, the heat energy in the conductor also increases.

    Nichrome wire is generally used as a heating element in heating appliances because it has the following features:

    It offers a very large resistance. So a large amount of electric energy is converted into a large amount of heat energy.

    It has a high melting point such that it can be heated till red hot without melting.

    Even at high temperatures, it does not get oxidized easily.

    Suggest Corrections 2

    SIMILAR QUESTIONS

    Q.

    Give two reasons why nichrome alloy is used for making the heating elements of electrical applicances.

    Q.

    Give any three characteristics of the material used for making heating appliances.

    Q. If nichrome has the heating effects of current then why is it not used in bulb as the filament?Q.

    Nichrome is used in electric heating appliances because, ___.

    Q. Give two reasons why nichrome alloy is used for making the heating elements of electrical appliances.

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    स्रोत : byjus.com

    Mark the correct reason/s why nichrome is used for making heating element of electrical appliances.

    Click here👆to get an answer to your question ✍️ Mark the correct reason/s why nichrome is used for making heating element of electrical appliances.

    Question

    Mark the correct reason/s why nichrome is used for making heating element of electrical appliances. 

    A

    Nichrome does not oxidize

    B

    Nichrome doesn't burn easily at high temperatures as it has higher melting and boiling point than metals

    C

    Nichrome has higher resisistivity and consequently a higher resistance

    D

    All

    Easy Open in App

    Updated on : 2022-09-05

    Solution Verified by Toppr

    Correct option is D)

    Nichrome is used for making heating element of electrical appliances. Because nichrome does not oxidize and burn easily at high temperature i.e.it has higher melting and boiling point than metals. Thus it does not melt even when a large amount of heat is produced due to passage of current. Moreover, It has higher resisistivity and consequently a higher resistance.Therefore, it will resist the flow of charges more, and lead to development of heat faster.

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    स्रोत : www.toppr.com

    Nichrome wire is used as the heating element because it has A. Low specific resistanceB. Low melting point C. High specific resistance D. High conductivity

    Nichrome wire is used as the heating element because it has A. Low specific resistanceB. Low melting point C. High specific resistance D. High conductivity. Ans: Hint: The rate of heat produced with time in a conducting material is given as $P={{i}^{...

    Nichrome wire is used as the heating element because it has

    A. Low specific resistance

    B. Low melting point

    C. High specific resistance

    D. High conductivity

    Answer Verified 254.7k+ views 2 likes

    Hint: The rate of heat produced with time in a conducting material is given as

    P= i 2 R P=i2R

    . Specific resistance of a material is its resistance when its length is of one unit and its cross sectional area is also of one unit. With this information figure out the correct option.

    Formula used: P= i 2 R P=i2R

    Complete step by step answer:

    Heating elements used electric appliances work on the principle of Joule’s law of heating. According to the law, when a current passes through a material, the material heats up. This is due to the resistance of the given material.

    One of these types of materials is nichrome wire.

    Resistance is the ability of the material to oppose the flow of charges when a potential difference is applied across the material.

    Suppose a conducting material of length l and uniform cross sectional area A, connected in a circuit in such a way that a potential difference is created across the material. Then according to Ohm’s law, there is current in the circuit. The material continuously consumes energy and converts the energy into heat.

    The rate of heat produced with time (power of heat) in the material is given as

    P= i 2 R P=i2R .

    Here, i is the current flowing in the material and R is the resistance of the material.

    This means that the heat generated in a conducting material is directly proportional to the resistance of the material.

    Specific resistance is the resistance of the material for one unit length and one unit cross sectional area of the material.

    Therefore, to produce more heat, the specific resistance of the material must be high.

    Hence, the nichrome wire is used as a heating element because it has high specific resistance.

    Thus, the correct option is C.

    Note: A nichrome wire is used as a heating element because of its high melting point and high resistivity (low conductivity) also.

    Having a high melting does not allow the nichrome wire to melt easily when a large amount of heat is produced.

    Resistance of a material is directly proportional to the resistivity of the material. Resistivity of the material is reciprocal of its conductivity. Hence, nichrome has high resistivity and low conductivity.

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    Related Questions Question 1

    The radius (r), the length (l) and resistance (x) of a thin wire are

    (0.2±0.02)cm (0.2±0.02)cm , (80±0.1)cm (80±0.1)cm and (30±1)Ω (30±1)Ω

    respectively. The percentages error in the specific resistance is-

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    ρ A ρA and ρ B ρB

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