Paper circuits

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This is a LED. It stands for Light Emitting Diode. The long leg is the positive (anode) side and the short leg is the negative (cathode) side.

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Another way to identify is that the cathode has a flat surface on the LED.

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I  choose to bend my anode like a lightning bolt, and my cathode like a 0 (zero).

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One thing I Iearned today is that different colors of LEDs use different amounts of energy. Therefore it may be necessary to double stack batteries, run a circuit in parallel, and/or choose a lower power LED color.

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