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The figure below shows an electric circuit with two bulbs B1 and B2 which are identical.
PhycF4T1P2Q16b
Explain what happens to the bulbs when

  1. S1 only is closed 
  2. S1 and S2 are closed 

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  1. Both bulbs light with the same brightness – they receive the same amount of current
  2. Only bulb B1 light.  Bulb B2 is short circuited
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