Fruit Supply Electricity Experiments Kids Children Student Learning Science Educational Toy Feature:for fun learningComes with everything needed to experiment with green energySet includes digital clock, light bulb, zinc /copper plates , wires etc.You may experiment with different fruit like lemon, orange,tomato etc.The fun is unlimitedDescriptionMaterial:Plastic,Metal Parts, Electronic ComponentsColor: As picture shownType:Children& 39;s Bio Energy Science KitAge:Ages 8+How It Works:1.The metal strips and potato make a simple battery that creates electricity to operate to operate the clock. Each potato works as a device called a electrochemical cell. It converts the chemical energy stored in the metal strips into electrucal energy. Two potatoes are needed to make electricity strong enough to run the clock. 2. A cell works because of the chemical properties of the metals inside (in this case the copper and zinc). The different properties cause tiny particles charged with electricity .(called ions) to move between the the two strips of metal. This flow is an electric current. The potato Contains the metals that allow the current to flow, but it stops the touching. Electric current also flows along the wires between the zinc and copper strips and the clock. This current makes the clock work. Size: all size Delivery color: as pictured Quantity shipped: 3