Question

If alloys have very high temperature ( they have quite high resistance and hence high temperature) , then why don't they burn at that temperature

Answer 1

Answer:

The alloys don't burn.

Explanation:

As the alloys have high resistivity, so according to ohms law, i.e.

V=I × R

here Potential and resistance are constant, so the current flowing through the wire wil be very less, and by Joules law of heating,

H = I^2 R T

HERE RESISTANCE IS CONSTANT BUT CURRENT IS VERY LESS AND AS HEAT ENERGY EVOLVED IS DIRECTLY PROPORTIONAL TO SQUARE OF CURRENT,

SO AS CURRENT IS VERY LESS, LESS HEAT WILL BE developed, and thus the wire won't melt, as the temperature won't reach to its melting point.

hope this helps you!!☺☺