My Home Made Solar Cell





Introduction: My Home Made Solar Cell

how to build a copper oxide solar cell with copper, glue, water, backing soda and a CD case
activate annotation on video for more information in english. coming soon a brief tutorial
The power output is less than 1mW but is measurable, help me to improve it!
Please excuse the errors in translation



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    am i looking at this correctly....70V, 70? wow. what kinda amps do you get from that?

    I am sorry but are only 70mv, 100mv with sunlight . It is the first cell that I have built I hope to improve it with your help

    As a follow up... 70mv at what amperage? BTW, very good 'able.

    well the amperage would depend entirely on what you hook up to it wouldn't it?

    Voltage = Amperage x Resistance, wouldn't the Voltage be constant, but reliant on the sun light?

    Not exactly. Ohm's law you're quoting anticipates an ideal power source (which would supply an unlimited amount of current and no matter how much power you draw the voltage won't drop). So in this case it's 70mV to 100 mV open-circuit voltage, that is voltage you measure with your voltmeter when you don't connect anything to the source. If you'd connect any load to the cell (even a VERY small one), the voltage would drop. This happens to every real electric source (even you wall plug, but the fuses prevent you from doing this as else the lines in your wall would get too hot from the overcurrent and burn down your house). You can't test it with your 110/230V wall sockets, but with an adaptor you can. Just measure the voltage coming out of it without connecting it to any load and then connect a load. The latter will be lower.
    As for amperage, there's a maximum amount of current a power source can supply. It depends on the turns of the coiling, strength of the magnet surrounding the coil, internal resistance of the wire, amount of power that can be harnessed to turn the generator (the bigger load you connect to it the harder it becomes to turn it) etc. The same applies to solar cells, just the relations are a bit different. So for solar cells they measure the maximal current it can supply by connecting the ammeter in series with the solar cell, effectively short-circuiting it (NEVER EVER do this with your wall plug unless you want to risk fire and a destroyed ammeter). This short-circuit current was probably the parameter bobtannica was asking for.

    from what i know, you cant get much more; copper oxide cells are very inefficient.

    that makes more sense, haha.

    It's cool... really 70v right.. but It's a low current. it can't working to turn on the led. you have to choice between current and voltage.

    Hi, one other thing. I read a little about copper oxide. I think the black stuff is copper(II) oxide, and the semiconductor you keep is copper(I) oxide. Is sounds like copper(II) oxide is very, very nasty stuff. I think you should be wearing gloves for handling it, and a respirator to not breath in the little flakes. I don't want to hear you've gotten sick :)