#### rokuez

##### New Member

Why don't I ever have to calculate how much voltage is left after the drop?

I asked a friend this and he said there "is no voltage left over". He gave an example of a basic series circuit with a 10 V power source, and three 1k Ohm resistors connected in series. I don't quite get what he means by no voltage left over...? Does he mean specifically that no electrons are entering the positive terminal of the power source i.e that they are all used up by the components?

I'm doing simple calculations with series circuits, but I'm just really curious. Is voltage drop all the matters i.e voltage reduction how much voltage was lost? What about the other voltage / potential difference after the drop across each component? Say we have 10 volts, and a drop of 1 volt. why am I always looking for that 1 volt drop, and not the remaining 9 volts left over so to speak.

I think of voltage as pressure so maybe I'm not conceptually understanding voltage. I think why not know the amount of electron/charge pressure so to speak after the pressure-reduction, or voltage drop.

Second part of my question kinda off on a little bit of a tangent...

Is it possible to measure voltage at one specific point. Or must voltage drop always be measured across a component?