1. All electrical appliances are called loads.
And these electrical appliances
(1) Some use the heating effect of current and are composed of resistors. For the time being we convert electrical energy into thermal energy.
(2) Some use the magnetic effect of current. The magnetic field of the current and other magnetic fields can produce mutual forces. This is the motor. The motor converts electrical energy into mechanical energy.
(3) Some use the chemical effect of electric current, such as electrolysis of salt water, which means we convert electrical energy into chemical energy.
The first type of electrical appliance composed of resistors, a load used to convert electrical energy into thermal energy, is a resistive load.
2. An electric furnace is an electrical appliance made of pure resistance, so it is a resistive load. The heat generated by the electric furnace is caused by the resistance wire.