ARRL Technician Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the ARRL Technician Exam. Study with multiple choice questions, hints, and explanations to boost your readiness and confidence. Ace your exam today!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

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
140 watts
150 watts

The correct answer is: 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.