It is a battery.
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That's a difference in electrical potential, not potential energy.It's described in units of "volts".
Look for a + by the positive terminal and a - by the negative terminal, or red for positive, black for negative. Some batteries have the positive terminal protruding and the negative terminal flat. Or you can get a meter that will tell you which is which,
No, because if the positive was 8, and the negative was -4, the difference would be positive four.
no
one is positive, the other is negative