Play around with this. If you can't get it to run (since it uses Java), maybe try it on a different browser - Firefox instead of Chrome.
You can build virtual circuits and basically see how they work. The moving balls are supposed to represent electrons.
The battery is a source of voltage. Recall that voltage is:
V = E/Q
- the amount of available energy per charge. The unit is the joule per coulomb, also known as a volt (V).
It can be a little confusing that the symbol for voltage (V) is the same as the symbol for its units (V). Hopefully the context will make it clear what the V is supposed to represent in data or an equation.
Battery image:
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