So I am confused when I am understanding voltage a volt = 1joule/coulomb and a c

Question

So I am confused when I am understanding voltage a volt = 1joule/coulomb and a coulomb is expressed as 6.24e18 charge carriers or one amp per second, now an amp represents movement or flow or current (dq/dt). so my confusion is that you can measure voltage in a circuit but not measure any amps ( if there is no path to flow) but voltage by definition involves joule/(amps per second). so if there is no current measured in a circuit but you are measuring voltage then the voltage is static or not moving. so i'm confused how a voltmeter measures that voltage if the pressure is there but is it moving or not moving because with no movement the equation would be joules/ 0amps per second. So.. I am looking for any clarification and physic understand answers. I am fond of examples such as marbles entering a tube represents the electrons. etc.. thank you!

Explanation / Answer

Charge is measured in coulombs, flow of charge is current which is measured in amps I =dQ/dt. so amp is expressed as coulomb per second. So coulomb is amp second ad no the amp per second. This is first thing you have to correct.

so Volt = joule/coulomb (or) joule/ amp-second. Your doubt is if current is zero Voltage should be infinte. But here time also there which means time to move that charge or(current) between to points. As there is no path to flow it will take infinte time. So here time is infinity. So as result it is a product of Zero and Infinity which results a constant. So There will be Voltage Even there is no Current.

As a definition Voltage is work done to move a unit charge between two points wchic are need not to be connected. But current is flow of charge in a closed path. So there will be Voltage Even there is no current.

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