ESA Certified Alarm Technician Practice Exam

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Which measurement is NOT derived from Ohm's Law?

Amperes
Volts
Ohms
Watts

The correct answer is: Watts

The correct answer is derived from the principles of electrical engineering and the relationships defined by Ohm's Law, which states that Voltage (Volts) equals Current (Amperes) multiplied by Resistance (Ohms). Each of these units—Amperes, Volts, and Ohms—can be directly calculated from Ohm's Law, as they represent fundamental aspects of electrical circuits. Watts, on the other hand, refer to a measure of electrical power and are not derived solely from Ohm's Law. Instead, Watts are calculated using the formula Power (P) = Voltage (V) x Current (I). This means that Watts take into account both voltage and current to determine the amount of energy used over time, which goes beyond the relationships established by Ohm's Law, thereby making it a distinct calculation. Understanding this distinction helps clarify the foundational principles of electrical measurements, ensuring that students grasp the interconnectedness of various electrical concepts and how they originate from one another through different formulas and laws.