Why same current flows through resistors in series?

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Discussion Overview

The discussion centers on the behavior of electric current in a series circuit with multiple resistors, specifically addressing why the same current flows through each resistor despite their differing resistances. The scope includes conceptual understanding and reasoning related to electrical circuits.

Discussion Character

  • Conceptual clarification, Exploratory

Main Points Raised

  • One participant questions whether the current through each resistor should differ due to their different resistances, suggesting that differing drift velocities of electrons would lead to charge buildup, which they argue is not physically possible.
  • Another participant agrees with the notion that differing drift velocities could cause charge accumulation at certain points in the circuit.
  • A third participant provides an analogy comparing the flow of current to cars on a lane, stating that if there is a speedbreaker (resistor), all cars (electrons) would slow down uniformly, implying that the drift velocity remains constant throughout the circuit.

Areas of Agreement / Disagreement

Participants generally agree that the current is constant throughout the circuit, but there is some exploration of the implications of drift velocity and charge buildup, indicating a nuanced understanding rather than a definitive consensus.

Contextual Notes

The discussion does not resolve the underlying assumptions about drift velocity and its implications for charge accumulation, nor does it clarify the relationship between resistance and current in a series circuit.

tasnim rahman
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If two or more resistors are connected in series, isn't the current through each resistor supposed to be different due to their different resistances? But this does not occur. Is this because, if the drift velocity of the electrons through the different resistors were different, then charge would tend to build up at certain points on the circuit, due to the differences in velocity. This is not physically possible and would also probably violate Kirchhoff's law.

Right?
 
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tasnim rahman said:
Is this because, if the drift velocity of the electrons through the different resistors were different, then charge would tend to build up at certain points on the circuit,

Yes.
 
Thank you very much.
 
Current is indeed constant throughout the circuit. Think it this way-
there's a lane(conductor) on which cars(electrons) are travelling. Lane is completely filled. If you put a speedbreaker anywhere, all the cars would eventually slow down due to the fact that the cars infront of each would slow down. So cars everywhere would have same "driftvelocity".
Cheers! :)
 

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