I will show you how to make a 9v battery flashlight. This is a list of things you will need:
1x LED (Any color. I used yellow.)
1x switch or button
1x 9v battery
The first thing that you will do once you have all of the materials is: bend the LEDs leads so it touches the switch and the positive contact on the battery. If you're not very experienced with electronics the longer lead on the LED is the positive lead.
Step 1: LED and resistor line up
Not everybody's LEDs and resistors are the same (obviously) so you could use this handy-dandy site http://led.linear1.org/1led.wiz
I used a 62 ohm resistor for a 2.4v LED but the battery was only at about 6.5v.
Step 2: Gluing and building the circut
Just a reminder to all of you guys be careful when gluing because it will HURT if you get burnt. And as you can see I am OBVIOUSLY an expert at using paint... yup. Hot glue the LED on the top left side of the battery but don't glue it on the diode itself. Glue the resistor in the middle so its touching the negative on the battery and one part of the switch. Hot glue the switch on the right side of the battery.
Just to point out the side of the battery that you should be putting the LED and switch on should have negative on the right side and positive on the left side.
Step 3: All done!
This is the finished product. I hope you enjoyed this instructable! Please comment!