Linked Questions

6
votes
3answers
25k views

Resistor on anode or cathode? [duplicate]

Some Arduino starter-kit projects show the resistor placed before the anode of a LED, coming from output, and others show it after the cathode, going to the ground. Is there any difference? Why?
0
votes
3answers
960 views

Current limiting resistor: where is it best to put it [duplicate]

I'm fairly new to this and I was wondering if it makes a difference if I put the current limiting resistor of a LED on the cathode or on the anode. Any "best practice" and why? Thanks!
-2
votes
2answers
962 views

Why is the resistor attached to “postive” terminal? [duplicate]

Alright so as I am learning this I have learned that electrons are arracted to the postive side. So when I seen this photo it confused me why the resistor is on the postive terminal side. (When ...
0
votes
2answers
192 views

Why can I put a resistor at either lead of this LED and still see its effects? [duplicate]

Just to add a little bit of context to the question, I am using an Arduino Uno and a breadboard. I have a 5V power source running to the positive (longer) lead of an LED (rated at about 2v and 20mA). ...
0
votes
2answers
86 views

How does this circuit work with a transitor? [duplicate]

If the current flows from the left side of the circuit namely positive side Why doesnt the led burn as the resistor is placed after the LED or if flows from the negative side.Where does the base of ...
278
votes
38answers
109k views

Basic Electronics Book [closed]

I need basic electronics books (diodes,transistors,current.. etc) as I am just starting out with electronics and want to have something to read over the holiday. Any suggestions of good beginners' ...
17
votes
7answers
56k views

Why do we need resistors in led

I've researched and it says that resistors limit the current flowing through the LED. But this statement confuses me because we know that in a series circuit, the current is constant at every point, ...
13
votes
7answers
2k views

Which everyday components involve flows of charge that are not electrons?

I like this explanation of why there's nothing wrong with conventional current being the opposite direction from electron current. It mentions batteries and fluorescent bulbs as two cases where the ...
7
votes
8answers
11k views

When does the placement of a resistor matter?

I've been a programmer for years but am very new to electronic engineering. So far I see people saying it doesn't matter where a resistor goes in your LED circuit as long as it is present, but it ...
9
votes
2answers
2k views

Why doesn't it matter if a resistor is before or behind an LED wrt voltage drop?

I have read that current is always the same within a circuit, but as far as I understood voltage is not. Every electronic part I use lowers the voltage more or less, even simple wires do this. So far, ...
7
votes
3answers
3k views

Changing the resistor to be in front or behind an LED doesn't affect brightness?

Note: I am very new to the more advanced side of electricity. I do not have a firm grasp on the exact mechanics. Lets say I have an example circuit: ...
5
votes
4answers
3k views

Why must resistors be on the respective anode terminals instead of the common cathode terminal of a RGB LED?

Different from the best answer of this one: Why does a resistor need to be on the anode of an LED? But well, I'm also an electronics noob ^.^ Recently I bought the official Arduino starter kit and ...
3
votes
2answers
820 views

A little clarification regarding voltages, and “real” current movement

To my understanding, the voltage supplies the potential, and free electrons are taken from ground? This makes somewhat sense to me, for example if something has a "positive" charge then it will ...
2
votes
3answers
151 views

Do the resistors affect every component of the circuit?

I've noticed something strange in the circuits schemes I saw in a book. Let's say that there is an LED and it's anode is connected to a 5V power source, and it's cathode is connected to ground. ...
0
votes
1answer
241 views

How do I determine how much battery and resistance is required to wire a series of LEDs? [duplicate]

I need to wire 5 led's in series with a switch and variable resistor to control brightness. These I think I think the circuit will need to look something like this (Ignoring the values the editor ...

15 30 50 per page