What do you guys use as a rule of thumb for safely sizing for wattage?
My resistor will see .5 watts. Calculated like this...
9V- 3.6Vf (LEDS in series) = 5.4V (LEDS are 1.2Vf, 100 mA)
5.4V/ 58 ohms = .093A
.093^2 x 58 = .501 watts.
What size resistor should I use? 1 WATT?
My resistor will see .5 watts. Calculated like this...
9V- 3.6Vf (LEDS in series) = 5.4V (LEDS are 1.2Vf, 100 mA)
5.4V/ 58 ohms = .093A
.093^2 x 58 = .501 watts.
What size resistor should I use? 1 WATT?