If a circuit has an applied voltage of 120 V and a current flow of 3 A, what is the resistance of this circuit?

To determine the resistance of a circuit when the voltage and current are known, Ohm's Law is used, which states that the resistance (R) can be calculated by dividing the voltage (V) by the current (I). The formula is given as:

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

In this scenario, we have an applied voltage of 120 V and a current flow of 3 A. Plugging in these values into Ohm’s Law gives:

[ R = \frac{120,V}{3,A} ]

[ R = 40,Ω ]

This calculation shows that the resistance of the circuit is 40 ohms, making it the correct answer.

Understanding this, one can infer that the other options do not align with the result obtained from the straightforward application of Ohm's Law using the provided values. Hence, the calculation clearly supports the answer of 40 ohms as the resistance of the circuit.