All of the above
The heating method has maximum power factor is Resistance heating.
Dielectric heating has leading power factor.
Dielectric heating is used for heating non-conducting materials.
Electric resistance heating
Temperature of the two bodies must be different
Temperatures of the two bodies are identical
Absorbs all incident radiations
Inside boiler furnaces
Electro-magnetic induction principle
Temperature on the outer surface of furnace walls will drop
High specific resistance
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