Question Video: Identifying the Unit of Electric Potential Difference | Nagwa Question Video: Identifying the Unit of Electric Potential Difference | Nagwa

Question Video: Identifying the Unit of Electric Potential Difference Science • Third Year of Preparatory School

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Which of the following is the correct unit of electric potential difference? [A] The ampere [B] The joule [C] The newton [D] The volt [E] The watt

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Video Transcript

Which of the following is the correct unit of electric potential difference? (A) The ampere, (B) the joule, (C) the newton, (D) the volt, (E) the watt.

To answer this question, we can consider the SI units shown in the options to see what quantity each unit measures. A newton is a unit of force. An electric potential difference is not a force. An electric force is a type of force, but force is not the same quantity as electric potential difference. A joule is a unit of energy. An electric potential difference is not a category of energy. There is a category of energy called electric potential energy, but this energy is not the same quantity as electric potential difference.

A watt is a unit of power, which is how much energy is transferred in a time interval. An electric potential difference is not a category of energy, so it cannot be transferred in a time interval to be a power measured in watts. An ampere is a unit of electric current. An electric potential difference is not an electric current. Electric current is not the same quantity as electric potential difference.

That leaves the volt. We can recall that the volt is the unit of electric potential difference. So, we recognize that the correct answer is (D), the volt.

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