I've always had a problem understanding resistors. Perhaps I just need to see an example, but until then, I'm completely stuck.
Say I have 3.3v of power with 40mA of current, and I want to power an LED that requires 2v and 20mA to run. What sort of resistor would I use to make sure I don't blow it out?
I know I can calculate the resistance of the two using Ohm's law, but is that what I'm supposed to do? Where do I go from there?
No problem.
Everything you could ever want to know about this specific problem is here. Best LED tutorial ever.
Yeah there are some laws and
Yeah there are some laws and math involved, but this is good also http://ledz.com/?p=zz.led.resistor.calculator
This site is pretty cool.
This site is pretty cool.
you might want to check this
you might want to check this out as well: http://www.allaboutcircuits.com/vol_1/chpt_2/1.html
For these kinds of things the thing you need is called ‘Ohms law’ and every roboteer should know it.
its a very simple forumla that describe how volts and amps and resistance relate to eachother.
its the basis for like 90% of all math in electronics.
See the video tutorials at
See the video tutorials at http://thenewboston.org/list.php?cat=41, videos 6 through 10 should be relevant to your question. There is also a lot of programming video tutorials on this website!
One thing to avoid a little
One thing to avoid a little confusion:
- Most power sources provide a certain VOLTAGE
- The CURRENT depends on what you connect, and it’s Resistance.
