Stop in for a cup of coffee

Mattax said

And here's the mistake I made too many times until it sunk into my head.
Volts when there is no electricity flowing and when there is a circuit working may not be the same!
When its flowing, if there is resistance, where we measure the pressure can make a difference.

Click to expand...

Yes, there is a voltage drop when current flows through a resistance... The higher the resistance, the more the voltage drop....

However, you need some resistance in a circuit, or the power will try to flow full blast at once... I like to think of resistance as regulating the current flow so it doesn't all want to flow at once like a short...