2002B3B. Lightbulbs of fixed resistance 3.0Ω and 6.0Ω, a 9.0 V battery, and a switch S are connected as shown in the schematic diagram above. The switch S is closed.
a. Calculate the current in bulb A.
b. Which lightbulb is brightest? Justify your answer.
c. Switch S is then opened. By checking the appropriate spaces below, indicate whether the brightness of each lightbulb increases, decreases, or remains the same. Explain your reasoning for each lightbulb.
i. Bulb A: The brightness \_\_\_ increases \_\_\_ decreases \_\_\_ remains the same Explanation:
ii. Bulb B: The brightness \_\_\_ increases \_\_\_ decreases \_\_\_ remains the same Explanation:
iii. Bulb C: The brightness \_\_\_ increases \_\_\_ decreases \_\_\_ remains the same
Explanation: