Cathodic Protection Tester Practice Exam

Power is primarily measured in which unit?

1. Volts

2. Watts

3. Amps

4. Ohms

The correct answer is: Watts

Power is primarily measured in Watts, which is the unit that quantifies the rate of energy transfer or conversion. One Watt is defined as one joule per second. In electrical terms, power is calculated as the product of voltage (measured in Volts) and current (measured in Amps). This relationship can be expressed in the formula: \[ \text{Power (Watts)} = \text{Voltage (Volts)} \times \text{Current (Amps)} \] Understanding this relationship is crucial in fields like electrical engineering, as it allows professionals to assess how much energy is being consumed or generated in a circuit. The other units mentioned—Volts, Amps, and Ohms—serve different purposes in electrical systems. Volts measure the electric potential difference, Amps measure the flow of electric current, and Ohms measure resistance. While all are interrelated through Ohm's Law and the principles of electrical systems, only Watts directly quantify power, making it the correct answer in this context.