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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How much current flows through a 100-ohm resistor connected across 200 volts?

1.0 amperes
1.5 amperes
2.0 amperes
2.5 amperes

The correct answer is: 2.0 amperes

To determine the current flowing through a resistor when a voltage is applied across it, Ohm's Law is used. Ohm's Law states that the current (I) is equal to the voltage (V) divided by the resistance (R). In this scenario, we have a voltage of 200 volts and a resistance of 100 ohms. Using the formula: I = V / R we can substitute the given values: I = 200 volts / 100 ohms = 2.0 amperes. This calculation demonstrates that when a 200-volt potential is applied across a 100-ohm resistor, it results in a current of 2.0 amperes flowing through the circuit. This is why the answer is correct. Understanding this relationship is critical for anyone studying electronics, as it provides the foundational knowledge for working with electrical circuits and troubleshooting.