Science Projects And Inventions

YOU  NEED

• An old Battery
• An Iron Nail
• A Fresh Lemon

Ask an adult to carefully cut open an old torch battery, use an ordinary battery and not an alkaline one.

Remove a piece of the outer casing made of zinc and  clean  it with sandpaper.  At this stage wash your hands and the zinc strip properly with soap.

Dry the  strip and stick it into a soft juicy lemon.  Also insert a copper screw or nail at a distance of about 5 mm from the zinc strip.

II you touch the nail and the strip lightly with the tip of the tongue  you will feel a slight tingle.

HOW DOES IT WORK?

You get  the tingling sensation because the zinc and iron react with the acid in the lemon to form a simple electric cell which  produces a weak electric current.