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Step 7The lemon Crab
In this design the cool thing is that the legs and claws of the crab are the battery.
This is used to light the crab's eyes.
It means that to make the eyes of the crab glow, you just have to squeeze a few lemon drops on each leg and claw of the crab ;)
In the detail, each leg/claw/cell is a 1 cm long piece of zinc wire, with a tiny strip of paper towel around it and a smaller strip of copper foil around the paper. It's a simple electrochemical cell activated when you drop a lemon juice drop on it and the paper becomes wet, because it becomes the electrolyte and electrons can flow through it.
Each cell generates about 0,7 V. There are 8 cells, and they are connected in series, 4 of them for each led.
This is used to light the crab's eyes.
It means that to make the eyes of the crab glow, you just have to squeeze a few lemon drops on each leg and claw of the crab ;)
In the detail, each leg/claw/cell is a 1 cm long piece of zinc wire, with a tiny strip of paper towel around it and a smaller strip of copper foil around the paper. It's a simple electrochemical cell activated when you drop a lemon juice drop on it and the paper becomes wet, because it becomes the electrolyte and electrons can flow through it.
Each cell generates about 0,7 V. There are 8 cells, and they are connected in series, 4 of them for each led.
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