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CBSE Class 10 Answered

What is resistance and why it oppose the flow of electrons?if it oppose the flow of electrons then electricity should not pass but after this electricity passes why?what is the benefit of opposing of electrons?
Asked by | 30 Apr, 2012, 07:01: PM
answered-by-expert Expert Answer
Resistance is a term that describes the forces that oppose the flow of electron current in a conductor. All materials naturally contain some resistance to the flow of electron current.
 
 
All conductors oppose electron current flow and warm up some, except the superconductors. That's because all conductors (save the superconductors) have some amount of resistance to the flow of current. That means any voltage applied will drive some current through a conductor, and the resistance will cause some amount of heating to take place.

 
Resistance can be both good and bad. If we are trying to transmit electricity from one place to another through a conductor, resistance is undesirable in the conductor. Resistance causes some of the electrical energy to turn into heat so some electrical energy is lost along the way. However, it is resistance that allows us to use electricity for heat and light. The heat that is generated from electric heaters or the light that we get from light bulbs is due to resistance. In a light bulb, the electricity flowing through the filament, or the tiny wires inside the bulb, cause them to glow white hot. If all the oxygen were not removed from inside the bulb, the wires would burn up.

Answered by | 30 Apr, 2012, 09:12: PM

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