What is the resistance of a circuit that draws 4 amperes from a 12-volt source?

To determine the resistance of a circuit using Ohm's Law, we can use the formula:

[ R = \frac{V}{I} ]

where ( R ) is the resistance in ohms, ( V ) is the voltage in volts, and ( I ) is the current in amperes.

In this case, the voltage ( V ) is 12 volts and the current ( I ) is 4 amperes. Plugging in the values:

[ R = \frac{12 \text{ volts}}{4 \text{ amperes}} = 3 \text{ ohms} ]

This calculation shows that the resistance of the circuit is 3 ohms. This answer aligns perfectly with the application of Ohm’s Law, confirming that the circuit behaves as expected under these conditions. Understanding this law is fundamental for analyzing electrical circuits, making this answer the correct choice.