AP P2

Complete the Question below.  

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In the circuit shown below, A, B,C, and D are identical light bulbs.  Assume that the battery maintains a constant potential difference between its terminals (i.e., the internal resistance of the battery is assumed to be negligible) and the resistance of each light bulb remains constant.

Draw a diagram of the circuit in the box below, using the following symbols to represent the components in your diagram.  Label the resistors A,B, C, and D to refer to the corresponding light bulbs.

->List the bulbs in order of their brightness, from brightest to least bright.  If any two or more bulbs have the same brightness, state which ones.  Justify your answer.

->Bulb D is then removed from its socket.

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Describe the change in the brightness, if any, of bulb A when bulb D is removed form its socket.  Justify your answer.

->Describe the change in the brightness, if any, of bulb B when bulb D is removed from its socket.  Justify you answer.

 B.  List the bulbs in order of their brightness, from brightest to least bright.  If any two or more bulbs have the same brightness, state which ones.  Justify your answer.

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Describe the change in the brightness, if any, of bulb B when bulb D is removed from its socket.  Justify you answer.

 

Bulb B becomes brighter.

It was receiving the least amount of current since D was an alternate pathway for the current.  With D gone all the current must go through B, which is in series now.  More current means B will be brighter.