Hello all, I am new to the site and forums so hopefully this isn't considered a stupid question.
I am just curious if the calculations for determining what resistor to use for an LED can be used with anything? For example, I know that for a 2.6V 28mA LED I would use a 100 ohm resistor of at least 1/8 watts.
My question is, if I want to connect a Garmin GPS receiver that requires 5V 80mA to a circuit which has an input of 12V, would I use the same math?:
(12V - 5V) = 7V
7V / .080 = 87.5 ohms
So would a 100 ohm resistor work for this as well, like it would for an LED?
Also, can anyone explain the math in determine what wattage resistor I should use? (1/8, 1/4, 1/2, 1, 2, etc)
Thanks a ton!
I am just curious if the calculations for determining what resistor to use for an LED can be used with anything? For example, I know that for a 2.6V 28mA LED I would use a 100 ohm resistor of at least 1/8 watts.
My question is, if I want to connect a Garmin GPS receiver that requires 5V 80mA to a circuit which has an input of 12V, would I use the same math?:
(12V - 5V) = 7V
7V / .080 = 87.5 ohms
So would a 100 ohm resistor work for this as well, like it would for an LED?
Also, can anyone explain the math in determine what wattage resistor I should use? (1/8, 1/4, 1/2, 1, 2, etc)
Thanks a ton!