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Circuits: Determine how brightness of bulbs change when switch is closed

See diagrams in attached file.

For each of the following circuits, determine how the brightness of the bulbs change when the switch is closed. Please see attachment


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Part A:

Let's call the bulb on the left Bulb #1 and the one on the right Bulb #2.

If the switch is closed Bulb #2 will turn off, because the current will be re-routed around Bulb #2 through the switch. This is because the electron charges will choose the path of least resistance, which is the switch, as opposed to the light bulb filament.

Bulb #1 will become brighter. Why? Originally the voltage source supplied a voltage V and a current I through a resistance R, which is made up of the resistances of the two light bulbs added ...

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