Martaine2005
- May 12, 2015
- 4,932
- Joined
- May 12, 2015
- Messages
- 4,932
Hi guys, I am a newbie here but thought my formulas were correct....Danggg..
Ohms law. V / I * R or a variation of the same.
I just read the STICKY on L.E.D's and formulas to figure out Resistance and Current..
My brain tonight is like mushy peas.
I thought .. 12v supply.. LED Vf 2v @20mah
Was 12 v - 2v = 10v. So 10v * 20ma
= 200 Ohms
Am I being thick? Real thick?
The example really threw me..
12v supply, Vf 10.2v (3 * 3.4v leds) ..Difference is 1.8v. So 1.8v * 10.2 = 18.36?
Or 10.2 / 1.8 = 5.6666..?
Can somebody please put this into plain English..
I promise to have math lessons
I promise to have math lessons
I promise to have math lessons
etc etc etc
100 lines.
Ohms law. V / I * R or a variation of the same.
I just read the STICKY on L.E.D's and formulas to figure out Resistance and Current..
My brain tonight is like mushy peas.
I thought .. 12v supply.. LED Vf 2v @20mah
Was 12 v - 2v = 10v. So 10v * 20ma
= 200 Ohms
Am I being thick? Real thick?
The example really threw me..
12v supply, Vf 10.2v (3 * 3.4v leds) ..Difference is 1.8v. So 1.8v * 10.2 = 18.36?
Or 10.2 / 1.8 = 5.6666..?
Can somebody please put this into plain English..
I promise to have math lessons
I promise to have math lessons
I promise to have math lessons
etc etc etc
100 lines.