Go Down

### Topic: direction of electricity in arduino (Read 283 times)previous topic - next topic

#### patgeek2019

##### Nov 11, 2019, 10:48 pm
the direction of electricity on arduino, is it direct current?, which that means  the displacement of negative electrons from the negative to the positive. It is why  resistance  is between led and ground

#### hammy

#1
##### Nov 11, 2019, 11:05 pm
Yes and then no ( you can put the resistor either side ; if in understand you correctly )

You need to learn about basic circuit theory , voltage , current , ohms law .

#### PerryBebbington

#2
##### Nov 11, 2019, 11:22 pm

Quote
The direction of electricity on arduino, is it direct current?, which that means  the displacement of negative electrons from the negative to the positive. It is why  resistance  is between led and ground.
What Hammy said.

Electrons always flow from negative to positive, that's basic physics, nothing you can do about it. Positive charge carriers, for example cations, flow the other way from positive to negative.

None of this has anything to do with where you place the resistor in series with an LED (or anything else).

You need to learn:
Ohms Law
Kirchoff's laws
To get you started.

#### Grumpy_Mike

#3
##### Nov 11, 2019, 11:31 pm
If you think it matters which direction electric current flows then you don't really understand how electricity works.

In a series circuit it does not flow into one thing first and then flow into the next thing. All the elements or components in a series circuit experience the same flow of current at the same time. With no current flowing the charge carriers are all hanging about doing nothing. Then, when a voltage is applied they all start to drift at the same time.

#### lastchancename

#4
##### Nov 12, 2019, 01:05 am
Call in @GolamMustafa, hell describe everything.
Experienced responders have a nose for laziness, (they were beginners once)... Sure, there are trolls, chest-beaters, and pretenders - but the help you'll get here is about as good as it gets - if you try to help youself!.

#### MarkT

#5
##### Nov 12, 2019, 03:30 pm
The sign of charge is an arbitrary human convention, invented before electrons were discovered.  We talk of "conventional current" as flowing from positive to negative, you don't actually care whether the charge-carriers are +ve or -ve charges for circuit analysis at all.

It does matter for understanding semiconductors and electron tubes however.

In most situations we don't worry about the direction of the current anyway because it will be going one way only, we only care about how much.

Yes, we are dealing with DC here, logic circuits run off a 5V or 3.3V (or sometimes less) DC supply.
[ I DO NOT respond to personal messages, I WILL delete them unread, use the forum please ]

#### patgeek2019

#6
##### Nov 12, 2019, 04:20 pm
thank you hammy

it was the only answer that helped me as a newbie in electronics

Go Up