Final answer:
The current flowing through the light bulb with a resistance of 400Ω is 0.3A, and the current flowing through the light bulb with a resistance of 800Ω is 0.15A when each is connected separately to a 120V power source.
Step-by-step explanation:
To calculate the current flowing through each light bulb when connected separately to a 120V power source, you need to use Ohm's law, which states that the current (I) through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) of the conductor. The formula is I = V/R.
For the bulb with a resistance of 400Ω:
Current (I) = Voltage (V) / Resistance (R) = 120V / 400Ω = 0.3A
For the bulb with a resistance of 800Ω:
Current (I) = Voltage (V) / Resistance (R) = 120V / 800Ω = 0.15A