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Transcript
Fruit and Veggie Batteries: Finding Current, Voltage and Resistance in Fruit and Veggies Name: ________________________ Date: ______________ Block: ________ Objective: In this activity, you will learn how current, voltage and resistance react in fruits and vegetables. Purpose: The purpose of this experiment is to determine the electrical voltage, resistance and current of different fruits and vegetables. to find out which fruits give the highest voltage outputs. to find out if the separation of the electrodes affects the voltage output and current. Examine the resistance across different fruit and vegetables. Hypothesis: Which fruit/vegetable will have the greatest resistance? Which fruit/vegetable will have the greatest voltage? Which fruit/vegetable will have the greatest current? Explain. _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ Materials: Fruits or vegetables: lemon, orange, apple, kiwi, grapefruit, potato, sweet potato Electrodes: copper wire and nickel wire Multimeter Alligator clips Procedure: 1. 2. 3. 4. Roll the fruit a little to make it a little juicier in the inside. Insert one electrode material into the juicy part of the fruit. Insert a second electrode into the juicy part of the fruit, but not so the two electrodes touch. Voltage measurements: -Measure the voltage of several different fruits/vegetables. USE DATA TABLE 1 Set the Multimeter so that it is measuring DCV (Direct Current Voltages). The 200m setting will give voltage readings up to 2.000 volts. If the readings are too high or too low, just change the dial to an appropriate setting. Since it may be hard to maintain a solid contact with the pointed Multimeter probes, it might be better if you use a pair of alligator clip leads and attach one side to the end of the pointed probe and clip the other end of the lead to the electrode. If you get a negative voltage reading, reverse the clips on the electrodes. 5. Current measurements: -Measure the current of several different fruits and vegetables. USE DATA TABLE 1 When making current or amperage measurements, turn the dial on the Multimeter to DCA (Direct Current Amperage) and set the dial at the range setting most appropriate for the range of current readings you are experiencing. The 200 μ is the most sensitive, which means that it will record the smallest currents while the 200 m is the range for the largest currents. 6. Calculate the resistance of the fruits and vegetables using Ohm’s Law, V=IR. USE DATA TABLE 1 7. Does the distance affect the current, voltage and resistance? Move the electrodes (anode and cathodes) different distances apart from each other and measure the current and voltage. Then calculate the resistance. Use Data Table 2 Data Table 1: Fruit/ Vegetable Voltage(V) Current(I) Resistance(Ω) Data Table 2: Fruit/Vegetable Separation (cm) Voltage(V) Current(I) Resistance(Ω) Data Analysis: 1. Which of the fruits and vegetables had the greatest resistance? 2. Which of the fruits and vegetables had the greatest current? 3. Which of the fruits and vegetables had the greatest voltage? 4. Does the insertion depth of the electrodes affect the voltage and/or current? 5. Does the angle of insertion of the electrodes affect the voltage and/or current? 6. How does having the electrodes touch above (or inside) the fruit affect the voltage and/or current? Conclusion: What fruit worked the best?________________ Were you correct? Why, or Why not? _____________________________________________________________________________________ _____________________________________________________________________________________ Extension: 1. Using alligator clip leads, make a series set of fruit cells and see what maximum voltage you can get. 2. Using alligator clip leads, make a parallel set of fruit cells and determine what the largest current you can get is.