5 - light bulbs
Light bulbs 1 and 2 each dissipate 180 mW at 12 V
Light bulbs 3, 4, and 5 each dissipate 45 mW at 9V.
1 - 12 V supply
2 - Resistors (Range 10-1000 Ω)
The design must meet the criteria:
Each light bulb can be independently turned on and off
Light bulbs 1 and 2 must get 12 V from the power supply when on.
The other light bulbs must get 9V (+/- 5%) from the power supply when on.
V = IR
P = I2R
The Attempt at a Solution
Light bulbs 1 and 2 have 800 Ω each.
Light bulbs 3, 4, and 5 have 1800 Ω each.
I can solve the diagram easily when I have only one light bulb on each time. It is when I have multiple light bulbs on that the voltages change and no longer fit the criteria.