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Calculating current flowing through a circuit and voltage drop?!

Discussion in 'Electronics Homework Help' started by Daniel280599, Feb 2, 2015.

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  1. Daniel280599

    Daniel280599

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    Feb 2, 2015
    My question is if the current going through the three lamps is 25mA EACH then what is the total current flowing through the circuit and and what is the voltage drop across the variable resistor. L Please could anyone show me how its done. Thanks.

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    Last edited by a moderator: Feb 2, 2015
  2. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    I think you can answer the first question yourself, think about the word EACH.
    Adam
     
  3. Daniel280599

    Daniel280599

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    Feb 2, 2015
    Do I just add them?
     
  4. duke37

    duke37

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    Jan 9, 2011
    The lamps look to be in parallel to me so adding would be the right thing to do.
    What then would be the voltage across the 100Ω resistor?
     
  5. Daniel280599

    Daniel280599

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    Feb 2, 2015
    7.5v?
     
  6. davenn

    davenn Moderator

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    Sep 5, 2009

    show us your working so we know you understand the process, rather than it just being a guess :)

    Dave
     
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