Hey, so I'm trying to make a simple device that will look similar to this:
http://oi42.tinypic.com/wgyl8i.jpg It's just a picture I drew up.
My Main question is for choosing the right Resistor.
My goal is to reduce the current of the 9V battery to 2mA by the time it reaches the sponge (see picture) and pretend all the wires are insulated copper wires.
What is the specs of the resistor I should get?
Also, do I need to put a resistor on both the wires to the cathode AND the anode or just one of them
http://oi42.tinypic.com/wgyl8i.jpg It's just a picture I drew up.
My Main question is for choosing the right Resistor.
My goal is to reduce the current of the 9V battery to 2mA by the time it reaches the sponge (see picture) and pretend all the wires are insulated copper wires.
What is the specs of the resistor I should get?
Also, do I need to put a resistor on both the wires to the cathode AND the anode or just one of them