Learn how a series circuit works in this free home maintenance video. Expert: Ross Safronoff Bio: Ross Safronoff started using a two piece VHS camera system, and then progressed to a 8mm camcorder, then Hi-8, followed by a mini-DV, and finally a Digital8. Filmmaker: Ross Safronoff
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13 comments
So… resisters cut down the amount of voltage through the circuit to prevent the diode (LED light) from blowing/burning out? (in this senario)
can this guy be more boring.
no it limits current flow! amps!
shouldn’t the resistor be placed before the LED instead of after it?
the resistor was there to protect the LED, and current flow from -to+, so wouldn’t it make more sense if it’s placed before the LED?
i mean, wut’s da point in putting a resistor after the current went through the LED, if i’m wrong plz tell me how that works?
You are right the resistor goes before the led; the guy was wrong when he said that electrons travel from – to +, actually is the opposite. It is this way for historical reasons, people did think that the electrical current was positive, so event after the discovery of the electron charge (-) we keep using the old convention.
k thx cuz that was bothering me quite a bit
it doesnt matter whether the resistor is before or after, since upon the current (electrons) motivated via a voltage to propagate through the diode will be resisted along its path. The path is the same, thus the resistance along the path will affect the flow of current across every component along that path
question
because the electrons flow one way, from the negative terminal, shouldnt the resistor be placed before the LED?……… also, i know before electron flow was understood, people thought electrons went from positive to negative (conventional current flow)….. is this the reason why you have the resistor before the LED? ……………. CAN SOMEONE SET ME RIGHT!! im finding hard to understand.
Current is the same in all parts of a series circuit, so the position of the resistor relative to the diode is irrelevant.
+ resistor…diode… – or + diode…resistor..-
Samo samo.
-Bobby
You are correct. Because electrons are flowing from the (-) terminal to the (+) terminal of the power source, the resistor must be placed in series with the LED (so that the resistor “intercepts” the current before it reaches the LED). This must be done because an LED can be easily damaged by too much current (most LED’s have a maximum forward current of 30mA and any more than that will burn out the component). The resistor restricts the flow of current. Hope that helps.
Very good, simple explanation. Nice job.
@godklr It doesn’t really matter. Imagine a river full of water, and the water represents the electrisity. If you have your feet in the water as it runs by, it wouldn’t be any different if you put a small “stop” (representing the resistor) before your position or after. Where ever you put that stop, as long as it would be in your “path”, it wouldn’t be too much flow to take you down the river.
@drios14
The Resistor can go before or after the LED as long as it’s in series, and? for your information, electrons are negatively charged so they are attracted to positive side of a power supply (battery). Conventional current flow only appears to go from positive to negative because of the holes left as the electron move along from negative to positive. Have a look round the web, plenty of information on the subject.
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