Final answer:
The voltage applied to the light bulb with a resistance of 100 Ω when a current of 1.2 A is running through it is calculated using Ohm's Law, resulting in 120 volts.
Step-by-step explanation:
To calculate the voltage applied to a light bulb with a resistance of 100 Ω and a current of 1.2 A flowing through it, we use Ohm's Law. Ohm's Law is stated as V = IR, where V is voltage, I is current, and R is resistance. In this case, we substitute the given values into the equation:
V = I × R
V = 1.2 A × 100 Ω
V = 120 V
Therefore, the voltage applied to the light bulb is 120 volts.