The coils of electric toasters and electric irons are made of an alloy rather than the pure metal because no pure metal meets the requirements of these wires used in electric irons and electric toasters. We know that pure metals have relatively low resistance.
Why are electric toaster and electric iron made of an alloy rather than pure metal?
We are asked why alloy is used to make the coils of electric toasters and electric irons instead of pure metal. … So, the resistivity of alloys is higher than that of pure metals. -Alloys do not melt easily at high temperatures, so alloys are preferred over pure metals.
Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal II Why are metals good conductors of electricity whereas glass is a bad conductor of electricity?
(b) Metal are good conductors of electricity because they have free electrons to conduct electricity. … Alloys have a high resistivity in comparison to pure metals. Therefore, alloys are used for making coils for electric heating devices rather than a pure metal.
Why are the conductor of heating device made of an alloy rather than a pure metal?
The conductors of electric heating devices such as bread toasters and electric irons are made of alloy because the resistivity of an alloy is more than that of metals which produces a large amount of heat. … Alloy does not melt readily and get deformed.
Why are the heating element of electric toaster?
When a negligibly small current passes through it, its resistance at room temperature (27.0 °C) is found to be 75.3 Ω. When the toaster is connected to a 230 V supply, the current settles, after a few seconds, to a steady value of 2.68 A.
Which material is used in an electric iron for heating?
Nichrome: Most resistance wire heating elements usually 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.
Why is the tungsten used almost exclusively for filament of electric lamps?
The metal tungsten is almost exclusively used for the filament of the electric lamp because it has a very high melting point due to which it does not melt even when it is heated to high temperatures due to the passage of electric current.
Which alloy is used in electric toaster?
An alloy of nickel and chromium (80%nickel, 20% chromium) is used in making heating elements for electric heating devices is nichrome.
Why alloys are used in toasters?
Coils of electric toasters and electric irons made of an alloy rather than a pure metal due to the following reasons: The resistivity of an alloy is higher than the pure metal. At high temperatures, the alloys do not oxidize. Alloy does not melt readily and get deformed.
Why are metals and alloys good conductors of electricity?
Due to the presence of free electrons around the metal atom, the electrons carry the electric charge in various directions. The electrons move in different directions inside the metals. … The metals present in alloys consist of free electrons and so they are good conductors of electricity.
Why tungsten is not used in heater?
Tungsten metal reacts with oxygen with air at high temperature and oxidized . So tungsten metal wire is not used in a heater. Tungsten oxidizes rapidly in air at high temperatures. … Tungsten has a much higher melting point, but it needs an inert atmosphere or a vacuum, such as inside an incandescent lamp.
Which metal is used in transmission wires?
The most common conductor in use for transmission today is aluminum conductor steel reinforced (ACSR). Also seeing much use is all-aluminum-alloy conductor (AAAC). Aluminum is used because it has about half the weight and lower cost of a comparable resistance copper cable.
Which is the best conducting metal?
What Metal is the Best Conductor of Electricity?
- Silver. The best conductor of electricity is pure silver, but to no surprise, it is not one of the most commonly used metals to conduct electricity. …
- Copper. One of the most commonly used metals to conduct electricity is copper. …
Why are alloys commonly used in electrical heating device?
As we know alloys have high resistivity and high melting point as compared to pure metals. So alloys cannot easily burn or oxidize at higher temperature. Now as we want higher temperature in heating devices so we use alloys in heating devices.
What are the heating element of electric toasters and electric iron?
The heating elements of electric toasters and electric irons are made of an alloy rather than a pure metal. Why ? The heating elements of electric toasters and electric irons are made of an alloy rather than a pure metal.