ARRL Technician Practice Exam

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Prepare for the ARRL Technician Exam with this interactive quiz. Study with flashcards, multiple choice questions, each providing detailed explanations and hints. Ace your exam with confidence!

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How much power is being used in a circuit when the applied voltage is 12 volts DC and the current is 2.5 amperes?

24 watts
30 watts
36 watts
40 watts

The correct answer is: 30 watts

To determine the power used in the circuit, you can apply the formula for electric power, which is given by the equation: Power (W) = Voltage (V) × Current (I) In this scenario, the applied voltage is 12 volts and the current is 2.5 amperes. Plugging these values into the formula yields: Power = 12 volts × 2.5 amperes = 30 watts. This calculation shows that the circuit is using 30 watts of power when a voltage of 12 volts DC is applied while drawing a current of 2.5 amperes. Thus, the correct answer reflects the relationship between voltage, current, and power according to the formula, solidifying the understanding that power is the product of these two fundamental electrical properties.