In a 12 V source across a 4 Ω resistor, what is the current?

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Multiple Choice

In a 12 V source across a 4 Ω resistor, what is the current?

Explanation:
Current through a resistor is found using I = V / R. With 12 volts across a 4-ohm resistor, the current is I = 12 / 4 = 3 A. The unit is amperes (A). This reflects Ohm’s law: the same voltage across a smaller resistance yields more current, and a larger resistance yields less current. If the resistance were different, the current would change accordingly—for example, 12 V across 6 Ω gives 2 A, while 12 V across 3 Ω gives 4 A.

Current through a resistor is found using I = V / R. With 12 volts across a 4-ohm resistor, the current is I = 12 / 4 = 3 A. The unit is amperes (A). This reflects Ohm’s law: the same voltage across a smaller resistance yields more current, and a larger resistance yields less current. If the resistance were different, the current would change accordingly—for example, 12 V across 6 Ω gives 2 A, while 12 V across 3 Ω gives 4 A.

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