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What is the unit of electromotive force that produces a current of one ampere in a circuit with one ohm resistance?

Watt

Joule

Volt

The unit of electromotive force, which is necessary to produce a current of one ampere in a circuit with a resistance of one ohm, is the volt. This relationship is grounded in Ohm's Law, which states that voltage (V) equals the product of current (I) and resistance (R). In this case, if you have a current of one ampere flowing through a resistance of one ohm, the voltage required to maintain this relationship is exactly one volt.

This is a fundamental concept in electrical engineering and physics, linking the concepts of voltage, current, and resistance. Each of the other options represents a different physical quantity: watt is a unit of power, joule is a unit of energy, and ohm is a unit of resistance. Understanding these differences is crucial for interpreting electrical systems correctly. The volt specifically quantifies the electromotive force, making it the most appropriate choice for this question.

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