I'm asking you all a very easy question relative to what is usually posted on here. I have a lot of "book-knowledge" on circuits, etc. but not much practical knowledge. So I thank you for your patience... If I'm trying to make a circuit with a 3V battery (watch-coin battery) and a 5mm LED that withstands 3V as well (to make a small flashlight), and a switch too...
1) I don't need a resistor since the voltage drop around the loop = 0?
2) Why have I seen some people putting two batteries in similar devices? Does that double the voltage?
3) Let's say the the voltage of the battery was 6V, with the LED still being 3V. Would I then need a resistor to add in that extra voltage drop?
Once again, thanks for your patience and help.
1) I don't need a resistor since the voltage drop around the loop = 0?
2) Why have I seen some people putting two batteries in similar devices? Does that double the voltage?
3) Let's say the the voltage of the battery was 6V, with the LED still being 3V. Would I then need a resistor to add in that extra voltage drop?
Once again, thanks for your patience and help.