Final answer:
To find the resistance in a circuit with a voltage of 12 volts and a current of 100 mA, we use Ohm's law and calculate R = V/I, resulting in a resistance of 120 Ω.
Step-by-step explanation:
The student is asking to find the resistance (R) in a circuit when given the voltage (V) and current (I). We will use Ohm's law, which can be expressed as V = IR, to find the resistance. Given that V = 12 volts and I = 100 mA (which is 0.1 A), we can rearrange the formula to R = V/I. Substituting the values, we get R = 12 V / 0.1 A, which equals 120 Ω (ohms).