If the voltage across a resistor is 12 V and its resistance is 4 Ω, what is the current?

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Prepare for the Electrical Academy Level 1 Test. Study with multiple choice questions, flashcards, and detailed explanations. Assess your knowledge and ace the exam!

Multiple Choice

If the voltage across a resistor is 12 V and its resistance is 4 Ω, what is the current?

Explanation:
Current is set by Ohm’s law: I = V / R. With 12 volts across a 4-ohm resistor, the current is 12 divided by 4, which equals 3 amperes. This shows how a given voltage pushes a certain amount of current through a resistor: higher resistance would reduce the current, while higher voltage would increase it.

Current is set by Ohm’s law: I = V / R. With 12 volts across a 4-ohm resistor, the current is 12 divided by 4, which equals 3 amperes. This shows how a given voltage pushes a certain amount of current through a resistor: higher resistance would reduce the current, while higher voltage would increase it.

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