Unfortunately, electricity cannot be seen; this makes it hard for some people to understand. We want to make this easier with an example. The processes associated with electric current are most easily explained on the basis of plumbing. A certain amount of water flows through it under a certain pressure.
Water pressure can be compared to voltage, which is measured in volts (abbreviated: V).
The amount of water flowing in a certain time corresponds to the current, which is measured in amperes (abbreviated: A).
If you multiply the voltage by the current, then you get the electrical power with the unit of measurement in watts (abbreviated: W).
We get a different value if we divide the voltage by the current. This is the resistance, which is measured in ohms (symbol: Ohm). It can be thought of as a faucet. When the faucet is open, the resistance is 0, the water flows freely. If the faucet closes, the resistance rises to an infinite value (∞) — the flow dries up Each consumer of current is a resistance, which must be supplied with a current of sufficient strength in order to function perfectly. Therefore, a small control bulb needs a thin wire, on the contrary, a powerful starter needs an especially thick wire.
Visitor comments