Why does Nichrome have a high resistance?

Nichrome, a non-magnetic 80/20 alloy of nickel and chromium, is the most common resistance wire for heating purposes because it has a high resistivity and resistance to oxidation at high temperatures. When used as a heating element, resistance wire is usually wound into coils.

Also asked, why do we use a Nichrome wire in a heater?

Most 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.

What causes a heating element to burn out?

A dryer's heating element operates on the same principle as the coil in an electric heater. If the coil gets too hot, it burns out. Among the conditions that can cause elevated temperatures are insufficient airflow in the element compartment, failure of safety devices and a power surge.

Why is it possible for a bird to sit on a high voltage wire?

Electricity flows along the path of least resistance. Birds don't get shocked when they sit on electrical wires because they are not good conductors of electricity. Their cells and tissues do not offer electrons an easier route than the copper wire they're already traveling along.

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