What is Resistance Heating Methods.

There are two method,

1) Direct resistance heating

2)Indirect resistance heating

(1) Direct resistance heating:

• The electric current is made to pass through the substance to be heated or charge itself.
• The electric current while passing through the charge produces IR loss which appears in the form of the heat thus, charge is heated up.
• Few examples of this heating method are resistance welding, electrode boiler for heating water, salt bath furnace. This is called as direct resistance heating.

(2)Indirect resistance heating:

• Current is passed through heating element and 1-R loss is produced which appears in the form of heat.
• This heat is passed on to the substance or charge to be heated by radiation and convection. This is called as indirect resistance heating. For example room heater, soldering iron, hot plate immersion water heater, electric oven, hair dryer, frying pan etc.