ARRL Technician Practice Exam

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Prepare for the ARRL Technician Exam with confidence. Study using flashcards and multiple choice questions, each equipped with hints and explanations. Ace your exam with ease!

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What is the voltage across a 10-ohm resistor if a current of 2 amperes flows through it?

5 volts
10 volts
15 volts
20 volts

The correct answer is: 20 volts

To determine the voltage across a resistor when a current flows through it, you can use Ohm’s Law, which states that Voltage (V) = Current (I) × Resistance (R). In this case, you have a 10-ohm resistor with a current of 2 amperes flowing through it. By applying Ohm's Law: Voltage (V) = Current (I) × Resistance (R) V = 2 A × 10 Ω = 20 V This calculation shows that the voltage across the 10-ohm resistor is indeed 20 volts. Therefore, in this scenario, the correct answer reflects the application of Ohm's Law correctly, providing a clear understanding of how voltage relates to current and resistance in an electrical circuit.