S SirBob New Member Nov 22, 2008 #1 Hi, This is probally a very easy question for the people that are concerned with electronics but... I have a pushbutton with a 2.2v 25mA LED indicator in it. What size drop down resistor do I need to put in seris with it to run it at 24vdc. Many Thanks Bob
Hi, This is probally a very easy question for the people that are concerned with electronics but... I have a pushbutton with a 2.2v 25mA LED indicator in it. What size drop down resistor do I need to put in seris with it to run it at 24vdc. Many Thanks Bob
F flat5 Member Nov 22, 2008 #2 r=e/i r=24-2.2/.025 r=872 or slightly more resistance to use a standard value. 1k is a good choice p=E (of the resistor) x I (or I x I x R) p=21.8 x .025 p=.545 watts a 1 watt resistor should be used Last edited: Nov 22, 2008
r=e/i r=24-2.2/.025 r=872 or slightly more resistance to use a standard value. 1k is a good choice p=E (of the resistor) x I (or I x I x R) p=21.8 x .025 p=.545 watts a 1 watt resistor should be used
D dog812 New Member Nov 22, 2008 #3 This may also help in the future.. Current limiting Resistor calculator for leds