Multiple Choice
Which of the following is the SI unit for measuring electric current?
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1. Intro to Physics Units
Introduction to Units
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What is the SI unit for potential difference?
A
(joule)
B
(ampere)
C
(watt)
D
(volt)
Verified step by step guidance1
Understand that potential difference, also known as voltage, is the work done per unit charge to move a charge between two points in an electric field.
Recall the definition of potential difference: \(V = \frac{W}{Q}\), where \(V\) is the potential difference in volts, \(W\) is the work done in joules, and \(Q\) is the charge in coulombs.
Recognize that the SI unit of work or energy is the joule (J), and the SI unit of electric charge is the coulomb (C).
From the formula, the unit of potential difference is derived as joules per coulomb, which is defined as the volt (V).
Therefore, the SI unit for potential difference is the volt (V), distinguishing it from joule (J), ampere (A), and watt (W), which are units for energy, current, and power respectively.
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