Two special characteristics of the element of an electric heater:a)low resistivity and high melting pointb)low resistivity and low melting pointc)high resistivity and low melting pointd)high resistivity and high melting pointCorrect answer is option 'D'. Can you explain this answer?

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Electric heater is device to heat water.... So when it have high melting pt. it we sustain heat nd won't melt....nd resistance means to oppose heat... So it should have high resistivity to heat water without getting damage....HOPE THIS WILL HELP YOU....!

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If an element is going to be used for electrical heater it must have to high restitivity bcoz and high melting point. Due to high restitivity the wire get heated so much . so it is necessary to be high melting point.

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When we use a heating element that has
1. High specific resistance: a small quantity of wire is used to generate the required amount of heat or else the quantity of wire would be required higher in order to heat.
2. High melting point: a higher melting point is selected so that higher temperature is attained. Nickel and chromium alloys are ideal as a heating element.

Answer

Answer:
Electric heaters are devices that convert electrical energy into heat energy. They consist of a heating element that is responsible for producing the heat. The element of an electric heater is usually made of a specific material that possesses certain characteristics to efficiently generate heat. Two special characteristics of the element of an electric heater are a high resistivity and a high melting point.

High Resistivity:
- Resistivity is the measure of a material's ability to resist the flow of electric current. It is denoted by the symbol ρ.
- In the case of an electric heater, the heating element should have a high resistivity to effectively convert electrical energy into heat energy.
- A material with high resistivity will offer a greater opposition to the flow of electric current, resulting in the generation of heat.
- This high resistivity allows the element to produce a significant amount of heat by converting a maximum amount of electrical energy into heat energy.

High Melting Point:
- The heating element of an electric heater operates at high temperatures to produce heat.
- Therefore, it is necessary for the element to have a high melting point to withstand these elevated temperatures without melting or deforming.
- A material with a high melting point can tolerate and sustain the high temperatures generated during the operation of the electric heater.
- This ensures that the element remains intact and functional even when exposed to extreme heat, thereby allowing for a longer lifespan of the heater.

Conclusion:
The combination of high resistivity and high melting point in the element of an electric heater is crucial for its efficient and safe operation. The high resistivity enables the conversion of electrical energy into heat energy, while the high melting point ensures the element can withstand the elevated temperatures produced during heating. These characteristics contribute to the effectiveness, durability, and safety of electric heaters.

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