Hi!

My previous/alt account is yetAnotherUser@feddit.de which will be abandoned soon.

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Joined 2 years ago
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Cake day: June 1st, 2024

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  • yetAnotherUser@discuss.tchncs.detoMemes@sopuli.xyzCool Japan 🌸
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    8 days ago

    … How many countries have you ever visited to say that

    Like, being able to speak the very basics I agree. Numbers, hello and goodbye, thank you, etc.

    But “If you can read this, you may come in” is pretty advanced. Like, probably requiring weeks of daily study level advanced to be able to understand.









  • If you (or anyone else) wants to check their understanding of voltage as the difference between two electric potentials, here’s a couple exercises I stole from a text book:

    (Note: Electric potential is also measured in Volt.)

    A battery has a constant voltage of 1.5V between its plus and its minus pole. What is the electric potential of the minus pole compared to ground potential when:

    1. The battery is on an electrically isolating mat?
    Solution

    The battery is not connected to ground. Therefore, no statements about the electric potential of either pole can be made.

    1. The minus pole is connected to ground?
    Solution

    Because of the connection, the electric potential of the minus pole equals that of the ground, which is by definition 0V.

    1. The plus pole is connected to ground?
    Solution

    Now the potential of the plus pole equals that of the ground. We know that the voltage difference between the plus and minus pole is 1.5V. Since this difference is measured by subtracting the potential of the minus pole from the potential of the plus pole the equation: 1.5V = p_plus - p_minus = 0V - p_minus => p_minus = -1.5V.

    Therefore the potential of the minus pole is -1.5V.

    1. The plus pole is connected to a generator producing an electric potential of 10,000V compared to ground?
    Solution

    Now the electric potential of the plus pole is also 10,000V. The potential of the minus pole must be 1.5V lower, so it must equal 9998.5V.








  • Vinegar?

    Proper pipe cleaning is done using a sodium hydroxide solution. Plus, it causes permanent blindness if it comes in contact with eyes:

    Other common uses of sodium hydroxide include: […]

    • as drain cleaners that convert pipe-clogging fats and grease into soap, which dissolves in water

    Like other corrosive acids and alkalis, a few drops of sodium hydroxide solutions can readily decompose proteins and lipids in living tissues via amide hydrolysis and ester hydrolysis, which consequently cause chemical burns and may induce permanent blindness upon contact with eyes.

    https://en.wikipedia.org/wiki/Sodium_hydroxide

    It’s genuinely dangerous, don’t handle this stuff if you don’t wear proper eye and skin protection.