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What is the total resistance in a parallel circuit with a 10 ohm lamp and a 15 ohm lamp?

  • physics -

    There is a formula you can use, but instead, do this:

    assume 150 volts>
    Current in 10 ohm resistor= 15a
    current in 15 ohm reistor= 10 a

    Net resistance= V/I= 150/25=6 ohms

    and of course, you can do it the geek way:

    1/Rtotal= 1/10 + 1/15

    1/Rtotal= (15+10)/150= 1/6
    Rtotal= 6 ohms.

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