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    Photocell ? jozx7r

    Do we need to know how to demonstrate the operation of a photocell? I never came across it until now, do we need to know it?

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      Yeah it's on the syllabus we need to now the demonstration of a photocell, I just checked, but I don't know it either!😂

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      Oh god, I don't know this .. haha thank you!

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