Volts, Amps, Ohms, Coulombs


Just as the title, what are they? What (and how) do they describe stuff?

I`d like to learn 😀

In: Engineering

You can think of electricity moving through a wire like water running through a pipe.

Volts (Electric potential) is like the water pressure of the pipe. It is effectively how much the water (or electrons) wants to get to the other end of the pipe.

Amperes (Current) is like the flow rate of water, in volume of water per second moving through any specific part of the pipe. An Ampere (amp) is 1 Coulomb per second.

Ohms (Resistance) are a measure of how a valve resists the flow of water. If you have a high-pressure (high voltage) pipe, but add a valve halfway through, the downstream half of the pipe will be at a lower pressure (lower voltage).

Coulombs (Electric Charge) are the actual charge of the electricity. A coulomb is defined as 1 Amp-second, meaning that they are like the volume of water delivered by a pipe at 1 amp for one second. If you have any chemistry background, a coulomb has a charge equal to ~6.2e+18 electrons, so I like to think of a coulomb as “the molar charge of an electron,” as an analogue to “the molar mass of an atom.”