Question

write 2 properties of a good heating element ​

Answer 1

Explanation:

Materials Used for Heating Elements

High melting point.

Free from oxidation in open atmosphere.

High tensile strength.

Sufficient ductility to draw the metal or alloy in the form of wire.

High resistivity.

Low temperature coefficient of resistance.

characteristics of a heating element?

(i) It should have a high resistance so that a major amount of electric energy is converted into heat energy. (ii) It should not get oxidised easily up to a temperature of 1000°C. (iii) It should have a high melting point and a low thermal Expansion so that it does not get loosened on getting heated.

Heat radiated H = 5.72 x k e [(T1/100)^4 – (T2/100) ^4]

H is in watts per square meter

T1 = Absolute temperature of radiating surface in Kelvin

T2 = Absolute temperature of radiating surface in Kelvin

k = Radiating efficiency and is constant (1 for single element, 0.5 to 0.8 for several elements placed side by side)

e = emissivity (1 for perfectly black body and 0.9 for resistance heating elements)

Stefan constant = 5.72 x 10 ^4 W m−2 K−4

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Answer 2

Answer:

The answer is in up please