# Electronic – How to explain current and voltage to a lay man

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A man asked me this question in suburban train when I told him that I am an electrical engineer. Of course I replied him that current is the flow of electrons and in order for the current to flow there should be a potential difference between them. But the man didn't know what electron or potential difference was either.

Offer him some water (or other beverage) to drink.

What happens when you drink a lot? You have to pee, which means there's some pressure that urges you to pee. This pressure is `voltage`.

Usually people do not pee in suburban trains. There's a resistance against the pressure.

On a toilet, human brains lower the resistance and there's a flow of pee. This flow is `current`.

The water analogy is a very common one (I'm surprised you haven't heard about it) It usually explains `voltage` as potential energy of water (from what height it's coming from), the `current` as the amount of water flowing and the `resistance` as the diameter of the tubing. (or something similar)

People go to great lengths with this analogy, finding substitutes for capacitors, inductors, etc.

You can find a lot of other analogies, because a lot of physics (our world) is driven by a difference in a certain value (different air pressure, different temperatures, ...) and some value changing, lowering that difference (wind blowing, heat exchange, ...).