If a circuit with E = 12 V and R = 4 ohms has a current I, what is I?

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Multiple Choice

If a circuit with E = 12 V and R = 4 ohms has a current I, what is I?

Explanation:
Current is determined by Ohm's law: I = V / R. With a 12-volt source across a 4-ohm resistor, the current is 12 divided by 4, which equals 3 amperes. If you sanity-check the other options: 1 amp would need only 4 volts, 4 amperes would need 16 volts, and 12 amperes would need 48 volts across the same resistance. So 3 A fits the given voltage and resistance.

Current is determined by Ohm's law: I = V / R. With a 12-volt source across a 4-ohm resistor, the current is 12 divided by 4, which equals 3 amperes. If you sanity-check the other options: 1 amp would need only 4 volts, 4 amperes would need 16 volts, and 12 amperes would need 48 volts across the same resistance. So 3 A fits the given voltage and resistance.

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