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Old 2nd May 2013, 11:45 AM   #1
M Gregg is offline M Gregg  United Kingdom
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Default Easy question? Why is voltage drop proportional to current in a resistor?

Easy question?

Why is voltage drop proportional to current in a resistor?
Ok We know the formulae...but what happens inside a resistor to create Voltage Drop?

ie we have two values of resistor in series...so we get a voltage drop across them dependant on value of resistance and current drawn..

So what is setting the resistance?..

Just for fun...

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Old 2nd May 2013, 11:47 AM   #2
AndrewT is online now AndrewT  Scotland
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resistance is the difficulty for the electron "cloud" to waft along the path (route).
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Old 2nd May 2013, 11:56 AM   #3
M Gregg is offline M Gregg  United Kingdom
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Quote:
Originally Posted by AndrewT View Post
resistance is the difficulty for the electron "cloud" to waft along the path (route).
Well,

Thats the question, why is the difficulty proptional to current and what is a voltage drop?

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Old 2nd May 2013, 12:03 PM   #4
AndrewT is online now AndrewT  Scotland
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Imagine the electron cloud as a group of football (american or rugby) trying to get from one end of the field to the other.
Place one opponent in the field and the group get to the other end easily (little difficulty)
Place 10 opponents in the field. The difficulty has increased.
Place 100 opponents in the filed. Now the route the players have to follow is quite convoluted. Some will even "bounce" back when hitting the immovable object.
Place 1000 opponents in the field. Getting the idea?

The voltage is the number of players trying to push their way along the field.
The resistance is the number of opponents.
The current is the number of balls that move along the route. (I'm not sure this last is a good analogy).
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Old 2nd May 2013, 12:04 PM   #5
AndrewT is online now AndrewT  Scotland
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Have you used the water flow analogy?
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Old 2nd May 2013, 02:04 PM   #6
M Gregg is offline M Gregg  United Kingdom
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I get your point,

However,
these are examples of its like this or that...

If you divide the resistance in half we have half the volt drop..at what point can you divide and have no volt drop?

what I'm saying is the volt drop is not at one end of the resistance..

So what the question really is...is whats actually happening?
IE why does resistance not exist in a super conductor..why should it be temp related?<<a bit off topic , however what is Volt drop? (related to resistance)

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Old 2nd May 2013, 02:16 PM   #7
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Default Universal Entropy....

Quote:
Originally Posted by M Gregg View Post
So what the question really is...is whats actually happening?
IE why does resistance not exist in a super conductor..why should it be temp related?<<a bit off topic , however what is Volt drop? (related to resistance)

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Hmmm, voltage drop is conversion of electrical energy to other forms of energy....the fine points of the hows and whys are maybe not fully answered yet ?.

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Old 2nd May 2013, 02:19 PM   #8
AndrewT is online now AndrewT  Scotland
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heat !
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Old 2nd May 2013, 02:27 PM   #9
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in reality it is all magic... the very idea of converting an "electron" to the radiation of "heat" (heat having a rather specific wavelength range) is in and of itself magical.

Why heat? Why not RF, why not xrays, why not visible light? (oh wait, we can do that too... heat+visible light = traditional lightbulb)...

It's magic in a very real sense. Electronic Engineering is only concerned with working with what *does happen* not so much why it happens. Physics of course is concerned with figuring out sort of why it happens, but we are rather limited in that regard. Thus it all remains sort of a grand mystery.

Like why does *anything* have the properties that it does?? Why does water have a liquid phase at all? And what's up with ice??

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Old 2nd May 2013, 02:34 PM   #10
M Gregg is offline M Gregg  United Kingdom
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Yes,

However current flow remains the same through the components..Volt drop is linked to the resistance value..


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