Which unit measures electric potential difference?

Which unit measures electric potential difference?

• A. A mpere
• B. Ohm
• C. Joule
• D. Volt

Answer: (D)

Electric potential difference, or voltage, is the energy transferred per unit charge as charges move between two points in a circuit. Its unit is the volt, defined as one joule per coulomb (1 V = 1 J/C). This is the quantity you measure with a voltmeter across components to know how much energy per charge is available to drive current. The other units correspond to different quantities: ampere measures current (the flow of charge), ohm measures resistance (how much a component resists current), and joule measures energy. Since the question asks for the unit that measures potential difference, the volt is the correct choice.

Electric potential difference, or voltage, is the energy transferred per unit charge as charges move between two points in a circuit. Its unit is the volt, defined as one joule per coulomb (1 V = 1 J/C). This is the quantity you measure with a voltmeter across components to know how much energy per charge is available to drive current. The other units correspond to different quantities: ampere measures current (the flow of charge), ohm measures resistance (how much a component resists current), and joule measures energy. Since the question asks for the unit that measures potential difference, the volt is the correct choice.