Discussion
Principle of operation of an electric water heater is by
Answer: C
In an electric water heater the heating element is in direct contact with the water or with the metal wall of the tank, so heat passes from the hot element to the water by conduction. The question asks for the principle of operation, and conduction is the answer the key accepts.
Convection only spreads the heat afterwards, as warm water rises and cooler water sinks. Radiation needs no contact and is not the main route in an immersed element. Induction heating works through a magnetic field in cooking surfaces and is not how a standard water heater works.
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