Question

Name two special characteristics of a heater coil.

Answer 1

Hint We can easily answer this question if we know about the heater and its function. Also we need to know the purpose of the heater coil and its requirements. Then only we can conclude with the correct characteristics of a heater.

Complete answer:
First of all let us find out about the heater.
Heater is a device which is used to heat or keep a place warm. When current is passed to the heater then the coil of the heater is heated up and radiates heat to the surrounding. Since the coil is continuously heated up, the melting point of the coil should be very high. We know that when the temperature of the coil will increase, the coil of the heater may melt down. So to overcome this issue the coil should have a high melting point. Also it should have very high resistivity as the length of the coil is small and the heater has to provide a good amount of heat.
Now, we can conclude that the special characteristics that the coil of the heater should have are:
1. High melting point
2. High resistivity

Note: The heating element is made up of Nichrome . Its resistivity is very high. It is an alloy made up of nickel and chromium. When we heat a metal conductor, it is very difficult for the electricity to flow through it. When we heat a metal, the electrons vibrate more, increasing the number of collisions and ultimately making the movement of free electrons very difficult.