Seems like you’d want to be careful with the source of the electrons so the negative terminal would be covered/protected and the positive would be wired to the frame. But it is the opposite. I presume there is a good reason that I do not understand.
In: Engineering
The direction electrons flow is, in terms of circuitry, irrelevant. Voltage is actually relative, and does not exist without two terminals. For instance, if you have the negative terminal grounded (at zero volts) and the positive terminal is “live”, then you can think of it as the positive terminal sucking electrons from the grounded terminal. This also means that grounded terminals are almost always safe to touch, no matter if they’re “positive” or “negative” (I use quotations because if it is grounded, it is at zero volts and therefore neither positive nor negative). In q high voltage system, if you’re shocked by a positive terminal, it is because the positive terminal sucks electrons out of you, which causes a shock. In this case, you are serving as the negative terminal.
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