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

This question tests your understanding of Ohm's Law, which describes the relationship between voltage, current, and resistance. The formula to find resistance is R = E / I, where R is resistance in ohms, E is voltage in volts, and I is current in amperes. By substituting the given values into the formula, we set up the equation as R = 12 volts / 4 amperes. Performing the division gives a result of 3 ohms. Distractors often come from using the wrong mathematical operation. For instance, multiplying 12 and 4 gives 48, which would actually be the power in watts, not the resistance. Subtracting or adding the numbers leads to the other incorrect options.