The unit will be, by definition of potential difference, joule per coulomb. But this is named to honour the scientist, Alexandro Volta, as VOLT, who did the conversion of chemical energy into electrical energy. This is the basis for all the secondary cells that we use in trucks, in mobile etc etc. Rechargeable ones.
a voltmeter is used to measure voltage
Many can measure both - Vrms (AC) or DC voltage.
Any one using a voltage test instrument can measure charge differential voltage.
The unit of measure for voltage is volt. Ohm measures resistance.
A voltmeter would measure the voltage. If you measure the voltage drop over a known low resistance you get a kinda-sorta idea of the power available.
You don't. You need test equipment to measure voltage.
A voltmeter measures voltage in volts.
An ammeter measures amperage not voltage.
To measure voltage accurately in an electrical circuit, use a digital multimeter set to the voltage range of the circuit. Connect the multimeter's probes across the component or points where you want to measure the voltage. Read the displayed voltage value on the multimeter's screen for an accurate measurement.
Decrease or reduction of voltage along the wire is called voltage drop. It is measure through wire and load resistance difference.
A voltage test meter is used to measure voltage potentials in a circuit.
The SI unit of voltage is the Volt, which is a derived unit equivalent to a Joule/Coulomb.