alloys are mixture of two or more metals, so they have high melting and boiling point than pure metal. Hence, elements of electric heating devices are made of alloy.
Why is the element of electric heating devices made up of alloys?
Alloys are used in electrical heating devices rather than pure metals because the resistivity of an alloy is more than the resistivity of a pure metal. Alloys do not burn easily even at high temperatures. … Nichrome does not burn easily at high temperature i.e. it has a higher melting and boiling point than metals.
Why element of electrical heating devices are made up of alloys B Give two reasons why different electrical appliances in a domestic circuit are connected in parallel?
The heating elements of electrical heating appliances are made up of alloy due to of following reasons: They have high melting points. They have high resistance. … Nichrome alloy does not undergo oxidation easily even at high temperature, it can be kept red hot without burning.
Why are the elements of electric heating devices such as bread toaster and electric irons 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. At high temperatures, the alloys do not oxidize. Alloy does not melt readily and get deformed.
What is the heating effect of electric current?
Whenever an electric current gets passed through the conductor, it produces heat because of the hindrance caused due to the conductor to the current flowing. The total work done for overcoming this hindrance to the electric current produces heat in the conductor. This is referred to as the heating effect of current.
Why is Nichrome commonly used in electrical heating devices?
Nichrome is used for making heating element of electrical appliances. Because nichrome does not oxidize and burn easily at high temperature i.e.it has higher melting and boiling point than metals. Thus it does not melt even when a large amount of heat is produced due to passage of current.
Why are circuits in homes connected in parallel?
Parallel circuits are used in homes because loads can be operated on their own. For example, if a series circuit was used, the lights would be dimmer with the addition of more lights. … The load has the full power of the circuit when using a parallel circuit instead of a series circuit.
Why alloys are used in electrical heating devices rather than pure metals?
Why are alloys commonly used in electrical heating devices? … 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.
Why tungsten is not used in heater?
due to very high melting point the tungsten wire cannot used in elctric heater and another reason is that due to heating effect of current.
Why are the conductor of heating devices made of an alloy rather than a pure metal?
Alloy is preferred over pure-metals for the manufacture of conductors of electric heating devices because: … Resistivity of an alloy almost does not change with temperature. So an element of alloy does not readily get oxidised at high temperature.