Hi, I am Jeri and I am a tenth grader doing my science fair project also on using fruits to conduct electricity. I'm currently writing some guides for people to try their own scientific experiments at home and school. Kubrick is simply a genuis director. Readings will probably vary from setup to setup, and from trial to trial. The total amount of electricity available is limited by the penny losing its copper plating or the nail becoming completely copper plated because once both electrodes are covered with the same metal you no longer have a battery.
Figure 1 shows diagrams of open, closed, and short circuits. Draw one line for series and one line for parallel. Yes No Thanks for your feedback! What did you read for each in 5 trials? Kimberly Long - Seattle, Washington March 2016 A. However during testing to determine how many micro-amps are produced when a penny and a zinc nail are inserted into a lemon and potato, the potato produces a much larger charge but, won't sustain the charge like the lemon does. Expect the potato to produce just less than 1 volt.
The Tested battery could've functioned without boiled potatoes. Yes, you can actually use fruits and vegetables as part of an electric power source! If it's not hooked up to a wire, it will theoretically last until the potato goes bad. You haven't told us anything about this clock, but it appears that it requires more current than your fruit batteries can generate. After purchase from the store and proper storage, the shelf life of potatoes past their sell by date is approximately. The acidity level is the independent variable that you will be varying and the voltage is the dependent variable that you will be measuring. How long an electrode -- more specifically, the anode -- lasts depends partly on what sort of electrolyte it is immersed in.
Electrical current is represented by the yellow arrows. It's really wonderful that you've been keeping this thread and information going for so long. He is trying to determine which fruit or vegetable produces the greatest electrical charge. You can make your computer syncronize itself with one of these over the internet. Basically, you come up with a standard experiment that follows the scientific method that you come up by yourself and perform on your own.
His hypothesis is that the potatoes placed directly on salt will give the most power as it will increase the electrodes the most. The electrons actually flow negative to positive. In an electrochemical cell, such as the potato battery, the copper wire makes the electrons move in the potato, causing energy to move into the clock. By using a dependent variable I would get the results to truly answer my question. This is the last day they may be sold, not consumed. Some benefits of proper food storage include eating healthier, cutting food costs and helping the environment by avoiding waste.
This is the highest current the battery can supply the current will also drop when the battery is attached to a load. Thanks a lot Sophia Allan - nyc, New York, U. If you had a large sheet of copper spaced very close to a large sheet of zinc, with a perfectly conducting acid between them, no resistance in your wiring, and a meter that did not suck up any of your power, that is the maximum voltage you could ever obtain from that particular pair of metals. These two configurations are shown in Figure 2. How do we get the power to run these devices? If the measured current is less than 2 mA, you can move down to the next lowest scale for improved accuracy. This engineering curriculum meets Next Generation Science Standards. So, how does electrical energy reach the wall outlet in our house? While you do not need to understand the details of the chemical reaction to do this project, it is explained in technical note at the end of this introduction.
I explained why the battery loses its charge faster if it's producing more current by speaking of a watering can: it holds only so much water, so the faster you pour, the sooner it will be empty. First, poke a hole in the potato for the thermometer to fit inside the middle. The most basic thing that happens is that if you put a metal rod into a mild acid like a fruit juice, a very small amount of the metal will dissolve into the acid, similar to the way that a certain amount of salt or sugar will dissolve into water. Place half of the potato slices in the bowl with no salt, then place the rest in the bowl with salt. He was helping his step daughter with a science project when he remembered a high school physics demonstration where a battery was formed by inserting two metal probes into a potato.
. Practicing proper hygiene and food safety techniques will help prevent foodborne illness. You want to measure voltage. Edward Meade - Sydney, New South Wales, Australia A. The use of pH paper is widespread in science projects for grades K thru 5. So, it would take dozens, if not hundreds, of potatoes to produce enough current to charge something like an iPhone.