Kaplan Nursing Entrance Practice Exam

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What is the unit of measure for electrical resistance?

Volts
Amperes
Watts
Ohms

The correct answer is: Ohms

The unit of measure for electrical resistance is Ohms. This unit is named after the German physicist Georg Simon Ohm, who formulated a fundamental law of electrical circuits known as Ohm's Law. This law states that the current flowing through a conductor is directly proportional to the voltage across it and inversely proportional to the resistance. In practical terms, resistance is a measure of how much a material opposes the flow of electric current. The higher the resistance in a circuit, the less current will flow for a given voltage. This concept is crucial in understanding electrical circuits, as it helps predict how components behave under different conditions. Other units mentioned have distinct functions: Volts measure electrical potential or voltage, Amperes measure the flow of electric current, and Watts quantify power. While these are all critical to understanding electrical systems, they represent different aspects of those systems compared to resistance, which is specifically defined in Ohms.