MCQs: Component combinations

Component combinations


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    No current flows so pd across r = 0V
    Pd from P to S = 12V


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    Total resistance = V/I = 12/0.5 = 24Ω
    Internal resiatnce = 4Ω


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    Total EMF = 6-6+6 = 6V
    I=V/R = 6/6= 1 A


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    Total EMF = 12+12 +6 = 30V
    I=V/R = 30/12 = 2.5 A
     


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    The one in the middle draws no current so can be ignored.
    Two 12Ω in series = 24Ω
    two 24Ω in parallel = 12Ω


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    R = 12 + 6


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    Two 12's in parallel = 6Ω
    Total = 6 + 12 = 18Ω


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    Total of each combination of 12 and 6 = 4Ω as in qu.1

    Two 4Ω in parallel gives 2Ω


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    1/R = 1/12 + 1/12 + 1/6 = (1 + 1 + 2)/12 = 4/12
    R = 12/4


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    1/R = 1/R1 + 1/R2 = 1/6 + 1/12 = (2+1)/12 = 3/12
    R = 12/3

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