Which option represents the unit of electrical strength?

The correct answer identifies the unit of electrical strength as the volt. The volt measures the electrical potential difference between two points in a circuit and is fundamentally associated with the force that drives electric current through a conductor. In essence, it quantifies how much electrical energy per charge is available in an electrical system.

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In contrast, the foot is a unit of length, the watt measures electrical power (the rate at which energy is used or produced), and the ampere measures the flow of electric current. Each of these units plays a different role in electrical terminology and applications but does not quantify electrical strength directly like the volt does.