Why Do Only the First Two People in a Parallel Circuit Get Strong Shocks?

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Discussion Overview

The discussion centers around the phenomenon observed in a demonstration involving a parallel circuit formed by humans, specifically why only the first two individuals experience strong electric shocks while subsequent participants do not. The scope includes conceptual understanding of electrical circuits and the behavior of current in series and parallel configurations.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant references a video demonstrating the shock effects and questions the underlying reasons for the observed behavior in the circuit.
  • Another participant argues that the circuit formed is not purely parallel, suggesting that the arrangement of arms and legs creates a series of resistors with parallel connections at junctions, leading to the first person receiving the most current.
  • A similar point is reiterated by another participant, who acknowledges the circuit's complexity and expresses a need to further analyze why the first person receives the strongest shock.
  • A different participant explains that the current flows through the first person and splits between the second person and the ground, resulting in diminishing current for each subsequent individual in the chain.

Areas of Agreement / Disagreement

Participants generally agree that the circuit is not a pure parallel configuration and that the first person receives the strongest shock due to the distribution of current. However, the exact reasoning and implications of the current flow remain partially unresolved, with different interpretations presented.

Contextual Notes

Participants express uncertainty regarding the assumptions about the circuit's configuration and the distribution of current among the individuals involved. The discussion does not resolve the complexities of the electrical interactions at play.

Edgardo
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Here's an episode of brainiac, where they test how much an
electric fence is shocking:
http://youtube.com/watch?v=-n1pSHzdahc

Now at time index 2:21 they build a parallel circuit with humans.
What I wonder about is why only the first two persons get strong shocks,
while the others don't. Can anyone explain this?

They also form a series connection at time index 4:20. The shock gets straight to the end.
 
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I watched the whole thing, pretty cool.

The circuit formed by these people wasn't really parallel. Think of the arms and legs as resistors. By holding hands, they formed a chain of resistors in series and at every junction forming parallel resistors by legs to ground.

So it makes sense the first person would receive the most current.


Now at the end, they insulated their legs. So the circuit was a just in series where current passes through them all.
 
what said:
The circuit formed by these people wasn't really parallel. Think of the arms and legs as resistors. By holding hands, they formed a chain of resistors in series and at every junction forming parallel resistors by legs to ground.

So it makes sense the first person would receive the most current.

I see now that it's not a pure parallel circuit.
Though I still have to think about why the first person gets the strongest shock by examining the circuit.

Thanks for you answer.
 
They even describe why the first guy gets shocked the most. The electricity starts flowing through the first guy, and some of it goes through the first guy to the second one, while some of it goes through the first guy to the ground.. So that guy gets the whole amperage through his body. The next one gets, maybe, half the amperage. Half of that goes to the ground, half goes to the next one. So the third person gets 1/4th the current
 

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