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Homework Help: Circuits with parallel resistors

  1. Apr 27, 2008 #1
    1. The problem statement, all variables and given/known data
    1) A circuit contains a 10V battery and three resistors in parallel. The resistors have values R1=10ohm, R2=40ohm, R3=50ohm. What is the voltage across each resistor?

    2)This time, the 3 resistors in parallel have values R1=10ohm, R2=20ohm, R3=500ohm. The current flowing through R2=100mA. What is the current flowing through R1?

    2. Relevant equations

    3. The attempt at a solution
    1) 10 V across each, because the voltage is the same across parallel resistors right?

    2) I made a V-I-R chart. Since R2 has a current of 100mA and its resistance is 20ohm, then the voltage is 2.0V. Since the resistors are in parallel, the voltage is the same for R1.
    So 2volts=I(10ohm)
    I=200 mA is this correct?
  2. jcsd
  3. Apr 27, 2008 #2


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    Homework Helper

    Hi chiurox,

    That looks correct to me.
  4. Apr 27, 2008 #3
    yeah thats absolutely right
  5. Apr 27, 2008 #4
    Oh... ok, I was a bit insecure. thanks
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