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## Homework Statement

Given =

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)

5- switches

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.

## Homework Equations

V = IR

P = I

^{2}R

## 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.