ARRL Technician Practice Exam 2025 – Complete Prep Guide

Question: 1 / 470

How much power is being used in a circuit when the applied voltage is 13.8 volts DC and the current is 10 amperes?

130 watts

138 watts

To determine the power being used in a circuit, you can use the formula for electrical power, which is given by the product of voltage and current. This means that power (measured in watts) can be calculated with the equation:

Power (P) = Voltage (V) x Current (I)

In this scenario, you have an applied voltage of 13.8 volts and a current of 10 amperes. By substituting the values into the formula, the calculation is as follows:

P = 13.8 volts x 10 amperes = 138 watts

This result of 138 watts accurately represents the power consumed in the circuit based on the provided voltage and current. Understanding this formula is crucial for evaluating power usage in various electrical applications.

The other choices do not match the calculated power value and would therefore not reflect the correct power consumption in this particular circuit.

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140 watts

150 watts

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