Discover which citrus fruits can power an LED lightbulb. You’ll need a bag of lemons, limes, grapefruits or oranges, a 2-inch copper nail and a 2-inch zinc nail. Use a micro ammeter, which measures electrical current, and an LED lightbulb that has at least two inches of wire lead. Insert the nails into the lemon so that they're three inches apart. Ensure that the tips of the fruit aren’t touching each other. Discard the insulation around the wires of the lightbulb and wrap one wire around each nail. Once both wires are connected, the bulb will light up and you can use the micro ammeter to measure the current. Experiment with the efficacy of different types of citrus fruits.
Use a potato, a plate, pennies, galvanized nails, copper wire, and a digital clock to create your own potato battery. Cut the potato in half and place the pieces face down on the plate. Wrap one end of the stripped wire around a nail and the other end around a penny. Insert the nail and penny into one of the potato pieces. Place a loose nail in the second potato piece. Wrap another piece of wire around another penny and insert into the second potato piece. Connect the wire from the penny on the first potato piece to the naked nail on the second potato piece. You should be left with two wire ends; experiment with how you must attach the wires to the digital clock to make the clock turn on.
Use six lemons, copper nails, zinc nails and copper wire. Insert the copper nail and zinc nail into the lemon and connect each to a piece of copper wire. Connect the two pieces of wire to the wires of a calculator. Will the calculator turn on? If one lemon isn’t enough, repeat the process and connect the wires until the calculator powers on.
If you’d like to further delve into producing electric charges, search for a correlation between electric charge and pH level. Procure fruit with a variety of pH levels, such as pumpkins, apples, bananas and oranges. Measure the pH level of each fruit with litmus strips. Insert a copper nail and a zinc nail into each fruit and complete the circuit with a voltameter. Record the current of each fruit. Create a graph with the charge on the Y axis and the pH level on the X axis. Connect the points on the graph to show the correlation between the two factors.