A circuit has a 12-volt source connected to a 4-ohm resistor. The current is:

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Multiple Choice

A circuit has a 12-volt source connected to a 4-ohm resistor. The current is:

Explanation:
Current in a circuit follows Ohm’s Law: I = V / R. With 12 volts across 4 ohms, the current is 12 ÷ 4 = 3 amperes. Amperes measure how much charge flows per second. If you changed the resistance while keeping the voltage fixed, the current would change inversely (more resistance means less current, less resistance means more current). The other numbers would require different resistance values, so they don’t fit this setup.

Current in a circuit follows Ohm’s Law: I = V / R. With 12 volts across 4 ohms, the current is 12 ÷ 4 = 3 amperes. Amperes measure how much charge flows per second. If you changed the resistance while keeping the voltage fixed, the current would change inversely (more resistance means less current, less resistance means more current). The other numbers would require different resistance values, so they don’t fit this setup.

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