What is the SI unit used to measure electrical potential difference?

What is the SI unit used to measure electrical potential difference?

• A. volt
• B. amp
• C. watt
• D. ohm

Answer: (A)

The concept being tested is the unit used for electrical potential difference, which is voltage. The electric potential difference represents the energy per unit charge needed to move charges between two points. The SI unit that quantifies this is the volt, defined as one joule per coulomb (1 V = 1 J/C). This is why voltage is measured in volts with symbol V. It’s distinct from current, which is measured in amperes; from power, which is measured in watts; and from resistance, which is measured in ohms. In practice, a voltmeter measures voltage, an ammeter measures current, and an ohmmeter measures resistance.

The concept being tested is the unit used for electrical potential difference, which is voltage. The electric potential difference represents the energy per unit charge needed to move charges between two points. The SI unit that quantifies this is the volt, defined as one joule per coulomb (1 V = 1 J/C). This is why voltage is measured in volts with symbol V. It’s distinct from current, which is measured in amperes; from power, which is measured in watts; and from resistance, which is measured in ohms. In practice, a voltmeter measures voltage, an ammeter measures current, and an ohmmeter measures resistance.