Question

The property/properties that must be possessed by a material to be chosen for making heating element of heating devices is/are:

1. (i) high melting point
2. (ii) high resistivity
3. (iii) low resistance

• A. None of these
• B. All
• C. 1, 2
• D. 2, 3

Answer 1

Answer:

C. 1, 2

• Properties Required

• 1.High Melting Point: The material must have a high melting point to with stand high temperatures without melting or deforming.

• This ensures that the heating element remains intact during operation

• 2.High Resistivity: High resistivity is important because it allows the material to generate more heat when an electric current passes through it.

• Higher resistivity means the material will resist the flow of electricity more, causing more heat to be produced, which is desirable for heating elements

• 3.Low Resistance: Low resistance is not a desirable property for heating elements.

• Low resistance would result in less heat generation, which is inefficient for heating devices.

• Instead, a material with higher resistance (or resistivity) is preferred to generate adequate heat