Voltmeters measure the potential difference (voltage) ACROSS a component. Connect the voltmeter in parallel with the device being measured.
Ammeters measure the current THROUGH a component. Connect the ammeter in series with the device being measured.
Don't parade your ignorance by talking about voltage going through things. Current goes through things!!!
Ideal voltmeters ...
- have infinite resistance
- no current flows through them
- do not disturb the circuit being measured
Real voltmeters come close to the ideal but are never perfect.
The circuit below shows the battery voltage being measured and also the voltage across the bulb. (the same in this case)
