Calculate the current for a 12 V source across a 4 Ω resistor.

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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

Calculate the current for a 12 V source across a 4 Ω resistor.

Explanation:
Ohm's law relates current, voltage, and resistance: current equals voltage divided by resistance. With a 12-volt source across a 4-ohm resistor, the current is I = V/R = 12/4 = 3 amperes. The current flows from the positive terminal through the resistor to the negative terminal. For comparison, 1 amp would come from 12 ohms, 2 amps from 6 ohms, and 0.5 amps from 24 ohms, so 3 A is the correct result for the given values.

Ohm's law relates current, voltage, and resistance: current equals voltage divided by resistance. With a 12-volt source across a 4-ohm resistor, the current is I = V/R = 12/4 = 3 amperes. The current flows from the positive terminal through the resistor to the negative terminal. For comparison, 1 amp would come from 12 ohms, 2 amps from 6 ohms, and 0.5 amps from 24 ohms, so 3 A is the correct result for the given values.

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