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Grade: 11
        
The electric power for a small town is provided by a hydro- electric plant at a nearby river. If you turn off a lightbulb in this closed-energy system, conservation of energy requires that an equal amount of energy, perhaps in another form, appears somewhere else in the system. Where and in what form does this energy appear?
4 years ago

Answers : (1)

Kevin Nash
askIITians Faculty
332 Points
							In hydroelectric plants, potential energy of water is converted into kinetic energy, which is transferred to the armature of a dynamo. This kinetic energy is converted into electric energy which can, then, be converted into mechanical energy or heat energy.
In the light bulb, the electrical energy is converted into thermal energy. So the electrical energy will appear in the form of heat in the light bulb. In accordance to Joules heating, as we turn off a light bulb in this closed system, the electrical energy will disappear and this disappear energy will absorbed in the electric wire, environment like floor, walls in the home. Therefore disappear electrical energy will appear in the form of heat.
4 years ago
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Course Features

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Course Features

  • 110 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


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