Make a lemon battery
A battery is a device that stores chemical energy and converts it to electrical energy through chemical reactions.
Four zinc nails
Four copper coins
Five crocodile wires and led
Place the coins and the nails on each of the four lemons as shown in the top images. Connect the nail on one lemon to the copper wire on the next lemon. Your battery is ready and the light turns on!!
The citric acid of the lemon reacts with the zinc and loosens electrons. Copper pulls electrons more strongly than zinc, so loose electrons will move towards the copper when the electrodes are connected by wires. Moving electrons are called an electric current, which is what lights up the led.