Cathodic Protection Tester Practice Exam

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What is the term used for the rate at which energy is used by an electrical device?

  1. Current

  2. Voltage

  3. Power

  4. Resistance

The correct answer is: Power

The term that signifies the rate at which energy is used by an electrical device is power. Power quantifies the amount of energy transferred or converted per unit of time and is typically measured in watts (W). In an electrical context, power can be calculated by multiplying the current flowing through the device (measured in amperes) by the voltage across the device (measured in volts). This relationship is captured in the formula: Power (P) = Voltage (V) × Current (I). Understanding power is essential in the context of electrical devices, as it helps determine how much energy they consume, which is crucial for energy efficiency, electrical billing, and overall device performance.

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