ARRL Technician Practice Exam

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Prepare for the ARRL Technician Exam. Study with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

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What is the current flowing through a 24-ohm resistor connected across 240 volts?

5 amperes
8 amperes
10 amperes
12 amperes

The correct answer is: 10 amperes

To determine the current flowing through a resistor when a voltage is applied, Ohm's Law is used, which states that the current (I) is equal to the voltage (V) divided by the resistance (R). In this scenario, the voltage across the resistor is 240 volts and the resistance is 24 ohms. Applying Ohm's Law: I = V / R Substituting the known values: I = 240 volts / 24 ohms = 10 amperes This calculation shows that the correct answer is indeed 10 amperes, which directly corresponds to the choice indicated. Understanding this relationship in Ohm’s Law is fundamental in electronics, as it helps in analyzing circuits by allowing one to calculate current, voltage, or resistance when the other two values are known.