Orange battery
- Preparation for the experiment: 2 petals of orange, 2 sections of thick copper wire, 2 pieces of zinc, 2 thin wires, 1 electronic watch.
- The main characteristic of the fruit battery is that the internal resistance is extremely large, and it can only supply power to the weakly used electrical appliances, such as electronic watches. The current supply current of the electronic watch is below 3A.
- Experimental method: peel off the orange under the stalk, use a thick copper wire removed from an old wire to insert the orange stalk as the positive electrode, and insert the orange stalk cut from the zinc skin of a small dry battery casing into the negative electrode to become an orange. Valve battery. The electromotive force of this battery is about 0.83V. Make another identical orange petal battery. The two batteries are connected in series to supply power to an electronic watch, and the electronic watch can work normally within 10 hours.
- Note: Orange batteries do not require strict size of the pole piece. The acidity of the orange and the relative position of the pole piece have an effect on the internal resistance. If the relative position of the pole piece is appropriate, the internal resistance can be reduced to about 0.03M.
- Preparation for the experiment: 4 tomatoes (or potatoes), 3 m copper wire, 1 earplug radio (or small electric beads with small power, sensitive galvanometer), 4 pieces of copper and zinc (the old battery can be used for zinc).
- Experimental procedure: Place the tomatoes (or potatoes) flat on the table, connect the wires with copper and zinc sheets into a series circuit, and connect the two wires in series to the earphone radio (or small electric beads, sensitive current meter). ) on the power board. Turn on the earphone radio to hear the sound (or small bead illuminating, sensitive galvanometer pointer deflection), to prove that the battery has electricity.
- Experimental preparation: 1 to 15 five-point coins, zinc tablets with the number of coins, paper, wire, a radio earplug, scissors, salt water.
- The experiment process: cut the paper into small wafers according to the size of the coin; cut the old battery zinc skin into coin-sized wafers; put the paper into the salt water; and arrange them in the order of coins, paper, and zinc sheets. This is the battery we made. Connect the two ends of the battery with a wire and touch the plug of the earphone radio to hear a click and prove that the battery has power.
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