Voltage, Current, Resistance definitions

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Discussion Overview

The discussion centers around the definitions of voltage, current, and resistance, particularly in relation to electrons. Participants explore these concepts through analogies and clarify their relationships, aiming for straightforward explanations suitable for understanding basic electrical phenomena.

Discussion Character

  • Conceptual clarification
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants propose that voltage can be understood as the force acting on electrons in a wire, analogous to water pressure in a pipe.
  • Current is described as the measure of the number of electrons passing a point in a wire per unit time, with a larger current indicating more electrons flowing.
  • Resistance is characterized as the interaction of materials with electrons, which can inhibit their movement, similar to a sponge restricting water flow.
  • One participant suggests that voltage represents the energy per electron, while current relates to the speed of electrons, and resistance is a factor that reduces this speed.
  • Another participant clarifies that current is not directly related to the speed of electrons, emphasizing that a large number of slow electrons can produce the same current as fewer fast electrons.
  • Resistance is discussed as a process of energy transformation rather than merely slowing down electrons, with a focus on energy loss as heat.
  • One participant references a water analogy for easier understanding but cautions against overextending this analogy and suggests transitioning to an energy-focused perspective.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between current and electron speed, with some asserting a connection while others argue against it. The discussion remains unresolved regarding the most accurate way to conceptualize these electrical phenomena.

Contextual Notes

There are limitations in the definitions provided, particularly regarding the assumptions about electron behavior and the simplifications inherent in analogies. The discussion does not resolve the complexities of these concepts.

mtanti
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Can someone please give a straight forward and easy to understand definition of the 3 mentioned phenomenone in terms of electrons if possible?
Thanks!
 
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Voltage is directly related to the force electrons feel in a wire. This force propels them through the wire. You can think of voltage (more correctly expressed as a difference in electrical potential) as an analogy to water pressure in a pipe. The pressure is what causes water to flow out of your tap, for example.

Current is a measure of the number of electrons that pass through some given point in a wire per unit time. The larger the current, the more electrons flow through the wire per unit time.

Resistance is caused by a material's interaction with electrons. Some material inhibit electrons from moving quickly through them, in the same way that a sponge shoving into your water faucet would inhibit the flow of water.

- Warren
 
So voltage is the amount of energy in each electron and current is the speed of the electrons whilst resistance is the multiple of speed reduced from the electrons?
 
Yes, voltage is related to the kinetic energy of each electron. An electron moving through a potential difference of 100 volts gains twice as much kinetic energy as an electron moving through a potential difference of 50 volts.

Current, however, is not related to speed. You can have a large number of very slow electrons passing some point in a wire, or a smaller number of very fast electrons, and the current will be the same. Keep in mind that the actual speed of electrons in wires -- the speed they move from one terminal of a battery to another, for example -- is quite slow. You should not worry much (at this point) about speed at all.

Resistance is not so much a process of slowing electrons down as it is a process of stripping them of kinetic energy and turning that energy into heat. Certainly, you can't reduce kinetic energy without reducing speed, but it's much simpler to view resistance as a phenomenon of energy rather than speed.

- Warren
 
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