Alloys are commonly used in electrical heating devices like electronic iron and heater .?

Question

Answer

-> They have high resistivity as compared to their constituent metals.->They do not burn or oxidise easily.->They have less electrical conductivity with low melting point.

Answer

Assertion alloys are commonly used in electrical heating devices . Reason resistivity of an alloy is generally higher than that of its constituent metal but has low melting point

Nichrome

Nichrome: Most resistance wire heating elements use nichrome 80/20 (80% nickel, 20% chromium) wire, ribbon, or strip. Nichrome 80/20 is an ideal material, because it has relatively high resistance and forms an adherent layer of chromium oxide when it is heated for the first time.

Answer

Alloys are commonly used in electrical heating devices like electronic iron and heater because:-
#Alloys are the substances which have a good resistivity.
#They do not undergo oxidation.
#They have high melting points.

Answer

Introduction:
Alloys are commonly used in electrical heating devices like electronic iron and heater due to their unique properties and advantages over pure metals. An alloy is a mixture of two or more metals or a metal and a non-metal. It is created by melting and combining different elements to form a solid material with improved properties.

Advantages of using alloys in electrical heating devices:
- Resistance to high temperatures: Alloys have higher melting points and better resistance to high temperatures compared to pure metals. This property is crucial in electrical heating devices as they operate at elevated temperatures. Alloys can withstand the heat generated during operation without melting or deforming.

- Enhanced strength and durability: Alloys are stronger and more durable than pure metals. They have improved mechanical properties such as hardness, toughness, and tensile strength. This makes them suitable for the demanding conditions in electrical heating devices, where they are subjected to repeated heating and cooling cycles.

- Improved electrical conductivity: Certain alloys exhibit better electrical conductivity than pure metals. This is important in electrical heating devices as it ensures efficient transfer of electrical energy to heat. Alloys with high electrical conductivity allow the device to reach the desired temperature quickly and maintain it consistently.

Types of alloys used in electrical heating devices:
- Nichrome: Nichrome is a widely used alloy in electrical heating devices. It is composed of nickel and chromium. Nichrome has a high melting point, excellent resistance to oxidation, and good electrical conductivity. These properties make it ideal for heating elements in electronic irons and heaters.

- Kanthal: Kanthal is another popular alloy used in heating devices. It is composed of iron, chromium, and aluminum. Kanthal has high resistivity, excellent oxidation resistance, and good mechanical strength. It is commonly used in heating coils and wires in electric heaters.

- Constantan: Constantan is an alloy of copper and nickel. It has a low temperature coefficient of resistance, which means its electrical resistance remains relatively stable with temperature changes. Constantan is often used in temperature control devices and thermocouples in heating equipment.

Conclusion:
Alloys are extensively used in electrical heating devices like electronic irons and heaters due to their superior properties compared to pure metals. They provide resistance to high temperatures, enhanced strength and durability, and improved electrical conductivity. Alloys such as nichrome, kanthal, and constantan are specifically designed for heating applications, making them essential components in these devices.

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