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The circuit below shows a torch bulb and lead plates dipped in dilute sulphuric acid and a battery of emf 12V.
         circuit showing a torch bulb and lead plates

  1. What would be observed if switch S1 is closed and S2 open? Give a reason for your answer.   
  2. State what is observed when S1 is open and S2 closed. 
  3. Swas closed for sometime and then opened and S1 closed. State what was observed.  

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  1. No observable change- Bulb does not light
    No current flows from the lead plates as not charged
  2. Gas bubbles observed on the two plates.
    positive plate turns dark brown 
    charging takes place.
  3. The bulb lights - The plates have been charged
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