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

Ohm's Law is used to find the missing resistance value in this circuit. Using the formula R = E / I, we substitute the known values: E (voltage) is 12 volts, and I (current) is 4 amperes. Dividing 12 by 4 gives a result of 3, so the resistance is 3 ohms. The distractor 48 ohms is the result of multiplying 12 and 4 (which calculates power), while the 16 ohms and 8 ohms options come from mistakenly adding or subtracting the values instead of dividing.