Potatoes have the ability to produce electrical current;with this science experiment children can learn how to make batteries from these tuberous crops. Stick a fork and a butter knife inside of three (or more) potatoes and connect them together with wire and form a circuit. Make sure to leave a loose wire at each end of the circuit. Next, connect a light emitting diode to the loose wires that remains at both ends of the potato circuit. Once the diode is connected to the potatoes the bulb will light up; if it doesn't try adding more potatoes to the circuit and/or ensure the wires are properly connected.
Electrical charges can cause items to move when they near an object. For a demonstration, pour cereal such as Corn Flakes or Rice Crispies onto a plate. Get a piece of wool and rub it across an old record on one side. Hold the side of the record that has been charged with the wool over the plate. Once the record is positioned over the cereal, the flakes will jump onto the record.
Children can bend water after learning this experiment; turn on a faucet and let a small stream of water pour out. This stream shouldn't be more than 1/8 of an inch thick. Charge a comb by rubbing it against a sweater or any other material that will produce static electricity. After charging the comb place it near the water and watch the liquid bend.
Building a homemade magnet is possible with some common household items. Take 3 feet of thin coated copper wire and wrap it around a large three inch nail and try not to overlap the wire. Leave about 8 inches of loose wire at both ends and cut the wire to obtain the proper lengths. Attach both ends of the wire to a size D battery and experiment this electromagnetic device by picking up paper clips. Wire used for this experiment gets very hot and children should have an adult to help them use the magnet in a safe and practical manner.