Does a Resistor Affect Current in a Circuit?

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A resistor in a circuit affects current by following Ohm's Law, which states that as resistance increases, current decreases, and vice versa. This occurs because resistors impede the flow of electric charge, causing a drop in potential energy without losing charge. The relationship between resistance and current is fundamental to understanding circuit behavior. The discussion also highlights a misconception that current remains unchanged, emphasizing the importance of recognizing how resistors influence current flow. Understanding these principles is crucial for grasping basic electrical concepts.
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Homework Statement


I'm trying to understand how does a resistor in a circuit affect the current...like this is what I'm getting...when the resistance of a circuit increases, the current passing through it decreases? And its the same for the opposite; as the resistance decreases, there is more current passing through it...Is this right? Like I can't really picture why exactly this happens. Like i though that the particles don't lose charge as they pass through the resistor, just potential energy, but how does it affect current...??
Maybe the current does not change?



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The Attempt at a Solution

 
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Resistors are simply made using high-resistivity materials.
http://en.wikipedia.org/wiki/ResistorAlso this thread does not belong here, it belongs in the appropriate physics/engineering forum.
 
Thread 'Correct statement about size of wire to produce larger extension'

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
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