need help with electronics (LEDs)
#1
need help with electronics (LEDs)
i love electronics but i need help with this one. it is dealing with LEDs, i need to figure out what resistor i need. i have
8 volts to supply the LED
the LED operates on 4 volts and requires .02 amps
how do i figure out what resistor i need?
i have googled LEDs but it keeps coming up with flashlights, i need to look longer maybe.
8 volts to supply the LED
the LED operates on 4 volts and requires .02 amps
how do i figure out what resistor i need?
i have googled LEDs but it keeps coming up with flashlights, i need to look longer maybe.
#5
So you have to drop the other 4V across the LED. Since current is known and will be constant across the resistor also, apply Ohm's law - R=V/I
4/0.02=200 Ohm.
Now what wattage? P=E2/R or I*V.
0.02*4=0.08W.
4/0.02=200 Ohm.
Now what wattage? P=E2/R or I*V.
0.02*4=0.08W.
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