The meter tells us this lemon battery is creating a voltage of 0.906 volts. I have connected a volt meter to our single cell lemon battery. Volts (voltage) is a measure of the force moving the electrons. Electrons will flow from the "-" electrode of a battery, through a conductor, towards the "+" electrode of a battery. Most metals (copper, iron) are good conductors of electricity. Certain materials, called conductors, allow electrons to flow through them. Electric current is a flow of atomic particles called electrons. All batteries have a "+" and "-" terminal. The zinc nail and the copper penny are called electrodes. Push a galvanized nail into the other side of the lemon. (Canadian pennies from 1960 - 2001 all worked)Ĭreating the battery: Insert a penny into a cut on one side of the lemon. The nail: Galvanized nails are coated in zinc. THE REQUIREMENT The lemon: A large, fresh, "juicy" lemon works best. The picture at the top of this page shows a basic lemon battery, a lemon, copper penny and zinc coated nail. It is possible to produce a dim glow from an LED. Batteries like this will not be able to run a motor or energize most light bulbs. Copper and Zinc work well as the metals and the citric acid content of a lemon will provide the acidic solution. Batteries consist of two different metals suspended in an acidic solution. Successfully creating one of these devices is not easy. Creating a battery from a lemon is a common project in many science text books.
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