Electrical circuit

Compare the brightnes of bulbs in the parallel and series circuits

                                                           a) Paraller circuits

                                    b) series circuits

1) In which circuit, the bulbs will lit up brighter ?
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2) State one disadvantage of a series circuit as compared to a     parallel circut.
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3) In this fair test, state the things that are:
    i) change   :_______________________
   ii) observed:_______________________

4) What can you conclude in this fair test ?
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