Question

a heat producing device should be used in an electric circuit.the device should have high resistance and low melting point.

Answer 1

Answer:

This electric circuit device should have High resistance and high melting point. ... This is because the heat generated in a circuit is directly proportional to the resistance of the wire. Now if a wire is used with high resistance the heat is transferred to the materials to be heated by the heater.

In a heating device the wires are generally insulator. The insulator have high resistance.

This is because the heat generated in a circuit is directly proportional to the resistance of the wire.  

Now if a wire is used with high resistance the heat is transferred to the materials to be heated by the heater. They should have high melting point.  

Otherwise due to the heat produced because of the high resistance would be sufficient enough to melt the wire. Thus destroying the machine.

Explanation: