Roll a lemon on a flat surface with the palm of your hand to release its juices. Then, straighten a metal paper clip and insert it about an inch into the lemon. Take a six inch piece of copper wire and insert this about an inch into the lemon but make sure the two metals do not meet. Connect a short piece of electrical wire to each piece of metal and then place the other end of each wire to a working flashlight bulb. The lemon and the metal electrodes should act as a simple electric cell that will cause the bulb to glow.
Take a piece of polythene and a fluorescent light tube into a dark room on a cold, clear day. Rub the polythene vigorously over the tube. As the two materials are rubbed together, static electricity is produced that will cause the light tube to glow. This experiment is best performed in cold, dry weather as cooler air acts as a better insulator and allows more static energy to be produced.
Put small amounts of salt, pepper and sugar on a clean plate, making sure not to mix them. Then take a plastic comb and rub it vigorously with a piece of wool. Hold the comb a few inches above the plate and slowly lower it towards the salt, pepper and sugar. Observe how the particles behave as the comb approaches. The lighter particles are attracted to the comb, which is charged with static electricity, first. This experiment will also work if you replace the comb with an inflated balloon.
Take three or four coins and arrange in a pile. Then soak some blotting paper in a saltwater solution before placing strips between the coins. Squeeze the coins and blotting paper tower you've made between your fingers and connect two short electrical wires to separate coins. Place the other end of the wires on your tongue. A small electrical current will be produced that will result in a slight tingling sensation.