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Make a battery using cheap materials like rusted iron rod, aluminium rod and strong solution of NaCl (common salt) in water.
Video at :
Rusted Iron Battery - YouTube
Video is not very clear. If you observe closely, you can see a light stream of gas emerging out of aluminium rod at right side.
Video at :
Rusted Iron Battery - YouTube
Video is not very clear. If you observe closely, you can see a light stream of gas emerging out of aluminium rod at right side.