Washington Esthetician State Board Practice Exam

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What unit measures the amount of electricity used in one second?

Volt
Watt
Ohm
Ampere

The correct answer is: Watt

The correct choice is watt, as it quantifies electrical power in a way that factors time into the equation. Specifically, one watt signifies one joule of energy consumed per second. This unit reflects both the voltage (the potential difference) and the current (the flow of electricity) in a circuit; essentially, it is calculated using the formula: Power (in watts) = Voltage (in volts) x Current (in amperes). This relationship illustrates how the watt is a comprehensive measure of electricity as it accounts for energy usage over time, making it integral in understanding electrical consumption. The other units listed serve different functions in the realm of electricity: voltage measures electrical potential, amperes quantify the flow of electrical current, and ohms represent resistance in a circuit. Understanding these distinctions is essential for grasping the various aspects of electrical principles in esthetics and other related fields.