Which of the following devices is/are based on heating effect of electric current?
(i) Incandescent lamp
(ii) Electric geyser
(iii) Electric generator

Correct option is C

The heating effect of electric current occurs when electric current passes through a conductor, causing it to heat up. Devices like the incandescent lamp and electric geyser work on this principle:
· Incandescent Lamp (i): The filament of the lamp gets heated due to electric current, producing light.
· Electric Geyser (ii): Converts electrical energy into heat to warm water.
· Electric Generator (iii): Does not operate on the heating effect; it works on the principle of electromagnetic induction to generate electricity.
Key Points:
· The heating effect is utilized in devices like heaters, geysers, and filament-based bulbs.
· It is caused by resistance in the conductor, leading to energy dissipation as heat.