So first off, I have only been learning this stuff, well since saturday really
I got a couple of Q's to ask...
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First off, i just want to confirm this really - is this the correct way of figuring out how much resistance i need for a 30mA LED?
R = V/A. It was a random guess which i think may be correct, that the amperage is the maximum rating on the LED? ie 30mA in this case.
So a 9v battery will need a resistance of 300ohms to stop the LED from blowing up. However, 330 ohms is used i know because of standard values.
If i am right please confirm me as i will be happy for figuring out
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Parallel LEDs
Do LEDs have resistance? Can i safely line up 3 or 4 or so LEDs in series without losing so much power?
Cause as i read the tutorial on this site, it recommends me not to align LEDs in parallel as it damages the LED or something along those lines.
So if it is a bad idea to use parallel, am I also correct that adding up the total amps required will give me the required resistance? So 3 30mA LEDs will consume 90mA, therefore doing the thing i did above would require then 100Ω? < Let me know on this, i need to know from my mistakes
I have made a little (and i mean little) schematic that i did in paint.net. As i do not know of any schematic makers.
by the way that battery is 9vDC
Is this the only way of having multiple LEDs together? Or is there a way that i can have them in a "parallel" sort of way?
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Grounding
I have even watched the video on the site about grounding a circuit. I see it in many schematics, and also a +Ve symbol at the top of the circuit.
No batteries are seen in the schematic either.
Can somebody explain to me why grounding is used and why +Ve is used at the top and what i will need to use it for later on in life?
-----------
Just to point out, i do understand ohm's law and i can work out how many amps or resistance is across a component in a circuit however, i have yet to see one tutorial on putting it in use and finding how much resistance i need over a component.
Thanks
I got a couple of Q's to ask...
---------
First off, i just want to confirm this really - is this the correct way of figuring out how much resistance i need for a 30mA LED?
R = V/A. It was a random guess which i think may be correct, that the amperage is the maximum rating on the LED? ie 30mA in this case.
So a 9v battery will need a resistance of 300ohms to stop the LED from blowing up. However, 330 ohms is used i know because of standard values.
If i am right please confirm me as i will be happy for figuring out
---------
Parallel LEDs
Do LEDs have resistance? Can i safely line up 3 or 4 or so LEDs in series without losing so much power?
Cause as i read the tutorial on this site, it recommends me not to align LEDs in parallel as it damages the LED or something along those lines.
So if it is a bad idea to use parallel, am I also correct that adding up the total amps required will give me the required resistance? So 3 30mA LEDs will consume 90mA, therefore doing the thing i did above would require then 100Ω? < Let me know on this, i need to know from my mistakes
I have made a little (and i mean little) schematic that i did in paint.net. As i do not know of any schematic makers.
by the way that battery is 9vDC
Is this the only way of having multiple LEDs together? Or is there a way that i can have them in a "parallel" sort of way?
-------------
Grounding
I have even watched the video on the site about grounding a circuit. I see it in many schematics, and also a +Ve symbol at the top of the circuit.
No batteries are seen in the schematic either.
Can somebody explain to me why grounding is used and why +Ve is used at the top and what i will need to use it for later on in life?
-----------
Just to point out, i do understand ohm's law and i can work out how many amps or resistance is across a component in a circuit however, i have yet to see one tutorial on putting it in use and finding how much resistance i need over a component.
Thanks