7 Years Factory Super Purchasing for 2016 China New Design Stainless Steel Slotted Flat Head Self Tapping Screw (DIN7972) Brasilia Manufacturer Supply to Zambia Factory from Laos

7 Years Factory
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 2016 China New Design Stainless Steel Slotted Flat Head Self Tapping Screw (DIN7972) Brasilia Manufacturer Supply to Zambia
 Factory from Laos

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  • Our lemon tree, two of our munchkin cats who love the lemon tree and 5 lemons.

    A 5 cell lemon battery was built and tested running a blue LED.
    You need lots of lemons to make it a success.
    I used 5 lemons in series but to really make it go well, you need at least 20 or 30 lemons in series parrallel strings of 5 at a time, to get a current of about 15 mA.
    Each lemon supplies about 0.9 volts between a copper electrode (positive) and a plated steel screw (negative). Total 4.5 Volts.
    It drops rapidly to the zenervoltage of the blue LED at around 2.5 Volts and a current of below 1 mA.
    For a red LED 4 lemons in series will suffice.

    The saltwater test has a better current and with 4 cells in series gave 3 Volts open circuit and 1 to 2 mA for the LED.
    Open circuit Voltage 3 Volts, loaded 2.4 Volts.

    It definitly proves the fact that a large surface area is needed for the electrodes to be in contact with the acid or salt to give a reasonable current.
    The internal resistance of the path of the electrons through the conducting medium is relatively high.

    Compare for example a 12 Volt car battery in size with a 12 Volt truck battery. Same voltage but for the truck battery a very large current compared with that for a car required for starting the engine.

    LED data:
    Red led 1.7 Volts 15 mA for good brightness
    Blue led 3.1 Volts 15 mA for good brightness
    ( most led’s are rated for 20mA continuous )

    The reason I put this experiment up on YouTube is that my 10 y.o. daughter wanted to know it for a school project, that if you could get power out of a lemon.

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