Hello, this is my first post here. I just started learning the basics of electronics and circuitry a few weeks ago, which is one of the reasons I joined this site. I have already read through a reasonable portion of text covering basic concepts in electricity and circuits but there is one thing that continuously confuses me due to some apparent inconsistency. As the subject says, I am confused about current flow direction and, by consequence, the proper location of resistors in a basic circuit.
Case in point - scrolling down to the middle of this sparkfun tutorial "What is a Circuit" they show a diagram (in the subsection entitled "The Simplest Circuit" with a circuit composed of a battery, resistor and one LED:
https://learn.sparkfun.com/tutorials/what-is-a-circuit
The diagram also indicates the direction of the current flow with a clockwise circular arrow from the positive to the negative battery terminal. This in itself is a little confusing to me because I learned from previous tutorials and other sources and that "charge" is actually moving in the opposite direction, from negative to positive, due to the flow of electrons. I understand that current can actually flow in both directions and that positive to negative direction was established as a standard for consistent polarity starting with Ben Franklin. What confuses me is that many of the same sources also stated that electrons, and thus "negative" particles, are the only things that move in copper wires. Logically, this implies to me that there should be serious practical considerations for positioning components on in a circuit if the actual movement is occurring from negative to positive. I understand just from reading that this is not actually the case, but my mind cannot detach itself from this simple logic.
Which brings me to my next point - the location of the resistor in this "simplest circuit." In the same diagram from sparkfun, the resistor is located "before" the LED in terms of the flow direction, accepting that the flow is from positive to negative, which is must be due to the polarity of the resistor and LED. Logically, this makes sense to me, since the resistor is needed to reduce current going into the LED. However, just below the diagram they post to a link to an animation in which the resistor is placed AFTER the led with respect to the current direction.
I have since read other tutorials and texts where I have witnessed the same "inconsistency" - sometimes the resistor is placed before the LED, sometimes after.
Can anyone please help me understand this? Thank you very much in advance.
Case in point - scrolling down to the middle of this sparkfun tutorial "What is a Circuit" they show a diagram (in the subsection entitled "The Simplest Circuit" with a circuit composed of a battery, resistor and one LED:
https://learn.sparkfun.com/tutorials/what-is-a-circuit
The diagram also indicates the direction of the current flow with a clockwise circular arrow from the positive to the negative battery terminal. This in itself is a little confusing to me because I learned from previous tutorials and other sources and that "charge" is actually moving in the opposite direction, from negative to positive, due to the flow of electrons. I understand that current can actually flow in both directions and that positive to negative direction was established as a standard for consistent polarity starting with Ben Franklin. What confuses me is that many of the same sources also stated that electrons, and thus "negative" particles, are the only things that move in copper wires. Logically, this implies to me that there should be serious practical considerations for positioning components on in a circuit if the actual movement is occurring from negative to positive. I understand just from reading that this is not actually the case, but my mind cannot detach itself from this simple logic.
Which brings me to my next point - the location of the resistor in this "simplest circuit." In the same diagram from sparkfun, the resistor is located "before" the LED in terms of the flow direction, accepting that the flow is from positive to negative, which is must be due to the polarity of the resistor and LED. Logically, this makes sense to me, since the resistor is needed to reduce current going into the LED. However, just below the diagram they post to a link to an animation in which the resistor is placed AFTER the led with respect to the current direction.
I have since read other tutorials and texts where I have witnessed the same "inconsistency" - sometimes the resistor is placed before the LED, sometimes after.
Can anyone please help me understand this? Thank you very much in advance.