Does Higher emf Affect Electron Flow?

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Discussion Overview

The discussion centers around the relationship between the electromotive force (emf) of a battery and the resulting electron flow in a circuit, particularly in the context of a toy fan powered by batteries of different voltages. Participants explore whether higher emf leads to increased drift speed of electrons or affects the operational time of the fan.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that higher emf results in a higher drift speed of electrons due to increased electric field strength, leading to greater force on free electrons.
  • Another participant poses a practical scenario comparing a 9V battery to a 1.5V battery connected to a toy fan, questioning which setup would result in faster fan movement.
  • Responses indicate that the fan connected to the 9V battery would turn faster, but the justification for this claim is debated.
  • There is a discussion about the rate of electron flow and how it relates to current and torque in the fan's motor, suggesting that a larger current leads to greater torque and faster operation.

Areas of Agreement / Disagreement

Participants express differing views on the justification for why a fan would operate faster on a higher voltage battery. While some agree that higher emf leads to increased current and torque, the exact reasoning and implications remain contested.

Contextual Notes

Some assumptions about the relationship between emf, current, and mechanical output of the fan are not fully explored, and the discussion does not resolve the nuances of how emf affects electron flow in practical applications.

Who May Find This Useful

This discussion may be of interest to those exploring electrical engineering concepts, particularly in relation to circuits, electromotive force, and motor operation.

shayaan_musta
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Hello experts!

Higher the emf of the battery implies that the higher the drift speed of the electrons or increase the flow time of electrons from the conductor?

Which one is true and how??
 
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Higher emf implies higher electric field strength in the wires of the circuit, so greater force on the free electrons urging them through the wires. So they will reach a higher mean drift speed (at which resistive collision forces balance the electric field forces). Can't, I'm afraid, understand your alternative, but I suspect that it's incorrect.

Hope this outline explanation helps.
 
I mean,
let a battery of 9volt is connected to the toy fan and on the other hand a battery of 1.5volt is connected to the toy fan.

So which fan will move faster?

Will higher emf cause the speed of fan to increase or increase the moving time of the toy fan?
 
The fan will turn faster on the 9V battery (or its motor will burn out!). [Can't see any mention of a fan in your first post...]
 
Philip Wood said:
The fan will turn faster on the 9V battery (or its motor will burn out!).

But how will you justify this statement from practical point of view?
 
I won't. I'll leave it to cleverer people – those, for example, who can interpret what you mean by 'a practical point of view'.
 
Philip Wood said:
I won't. I'll leave it to cleverer people – those, for example, who can interpret what you mean by 'a practical point of view'.

I mean If someone asks you that on 9volt battery fan move faster than on 1.5volt battery, why? then what will be your answer?

Either more electrons move from 9volt battery to fan than 1.5volt battery or some else reason you would give in justification for your answer?
 
The rate at which electrons flow round the circuit – your "from ... to" is a bit misleading – is increased (for reasons sketched in my first reply on this thread). So a larger current flows through the coils of the motor in the fan, so these (sitting as they are in a magnetic field) experience a greater torque, and the motor runs faster (until this electromagnetic torque is balanced by that from resistive forces).

Is this the sort of explanation you're looking for?
 
Yeah.. Thanks a lot. Thread is solved now. :)
 

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