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PSI Barbering Practice Exam
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What is the unit of measure for electrical resistance?
Volts
Amperes
Ohms
Watts
Reveal Answer
Correct Answer:
Ohms
Explanation:
The unit of measure for electrical resistance is Ohms. This measurement arises from Ohm's law, which states that resistance (R) is equal to the voltage (V) divided by the current (I). Ohms provide a standardized way to express the opposition that a material offers to the flow of electric current. Understanding the other units can help clarify why Ohms are critical for measuring resistance. Volts measure the electrical potential difference, Amperes (or amps) quantify the flow of electrical current, and Watts represent the rate of energy transfer in an electrical circuit. Each of these has its distinct role within the field of electricity and electronics, but when it comes specifically to resistance, Ohms are indeed the accepted unit.
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