How does a battery make a current?

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    Battery Current
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Discussion Overview

The discussion revolves around the mechanisms by which a battery generates electric current, specifically examining the effects of wire shape (straight vs. bent) on current flow. Participants explore analogies and the relationship between electric fields and current in conductive materials.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that a straight wire should allow for larger currents compared to a bent wire due to a more direct electric field alignment from positive to negative charges.
  • Another participant compares electric current to water flow in a pipe, questioning whether the curvature of the pipe affects flow rate.
  • A different viewpoint asserts that if the resistance of the curved wire is the same as that of the straight wire, then the current will also be the same, referencing Ohm's law (I=V/R) and stating that wire curvature is not relevant.
  • Another participant elaborates on the mechanism of electrical force transfer in wires, using an analogy of people holding hands to illustrate how conduction electrons respond to charge density changes.

Areas of Agreement / Disagreement

Participants express differing views on the impact of wire shape on current flow, with no consensus reached regarding the relevance of curvature versus resistance in determining current magnitude.

Contextual Notes

Assumptions regarding resistance equivalence between straight and curved wires are not fully explored, and the discussion does not resolve the implications of electric field orientation on current flow.

hokhani
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If a battery run a current by making the positive charge at one end and negative charge at the other end, in other words by making an electric field inside the wire, then we should expect to have larger currents when the wire is straight rather than bent. In the straight form, the electric field inside the wire is directly pointed from the positive charge to negative while in the curved form the effects of the electric field is less than straight one. Is this true? I would be grateful if anyone please explain this.
 
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You can compare the electric current to a flow of water in a plastic pipe that has a pressure difference between its ends. Does the flow rate of water depend on the curvature of the tube?
 
hokhani said:
we should expect to have larger currents when the wire is straight rather than bent
Assuming that the resistance of the curved wire is the same as the resistance of the straight wire, then the currents will be the same. The current depends on the resistance by ##I=V/R##. The curvature of the wire is not relevant.
 
hokhani said:
In the straight form, the electric field inside the wire is directly pointed from the positive charge to negative while in the curved form the effects of the electric field is less than straight one. Is this true? I would be grateful if anyone please explain this.

The electrical force is transferred through the wire because the conduction electrons react most to the charge density in their immediate neighborhood. Think of a line of people who are holding hands and are instructed to squeeze the hand of the person on their left side when their own right hand gets squeezed.
 
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