271445 1470 Technology true Tue, 27 Oct 2009 12:27:09 -0700 LED light,lemons How To Power an LED With Lemons http://www.howcast.com/videos/271445-How-To-Power-an-LED-With-Lemons http://www.howcast.com/videos/271445-How-To-Power-an-LED-With-Lemons/edit approved 0 nowpotternow http://img.howcast.com/images/icons/howto-xxlarge.png 35 102020 1 0 Step Soften the lemon Roll a lemon around on a table to soften up the inside without breaking the skin. If it’s too firm, it could reduce the battery’s charge.

]]> 102021 2 0 Step Put the copper in Use the knife to cut a slit in one lemon and insert the wire so a bit of it sticks out. This is your battery’s positive terminal.

]]> 102022 3 0 Tip If you have a U.S. penny minted before 1982, or a Canadian penny from before 2001, you can also use those.

]]> 102023 4 0 Step Put the nail in To make the negative terminal, push the nail into the lemon about 2 inches from the penny. Leave a little of the nail exposed above the skin. Make sure the copper and nail are not touching, or it will cause a short.

]]> 102024 5 0 Step Measure the current Turn on the voltmeter. Touch the positive lead to the penny, and the negative lead to the nail. If the meter indicates that the lemon is creating a little less than one volt or more, you’ve successfully made a battery.

]]> 102025 6 0 Tip You’ll know you have the leads connected backwards if the voltmeter registers a negative number.

]]> 102026 7 0 Step Make more batteries Make three more lemon batteries. A single lemon won’t produce enough electricity to light the bulb.

]]> 102027 8 0 Tip Test each battery with the voltmeter to make sure you have four working batteries.

]]> 102028 9 0 Step Connect the batteries Clip the first jumper wire to the nail in the first battery, then run the second wire from the penny of the first lemon to the nail in the second lemon. Then connect the penny in the second lemon to the nail in the third, and the penny in the third to the nail in the fourth.

]]> 102029 10 0 Step Light the bulb Light the LED by connecting the first jumper wire from the nail to the negative connection on the LED. The negative connection is the wire nearest the flat spot at the base of the light. Then clip a jumper wire from the penny of the last lemon in your chain to the positive connection on the LED and presto! Lemon-powered light!

]]> 102030 11 0 Fact Did you know? The world’s largest battery energy storage system is in Fairbanks, Alaska.

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