Physics.

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A 15.0- resistor and a 20.0- resistor are connected in parallel. A 5.00- resistor is connected in series with this parallel arrangement. The resistors are connected across a 1.00 10^2-V battery. What is the current flowing through the 20.0- resistor?

IS it 3.15 A?

  • Physics. -

    That's not what I got.
    The equivalent resistance of the 20 ohm and 15 ohm resistors in parallel is, in ohms, (20 * 15)/(20 + 15). Add that to the 5 ohm resistor connected in series. Finally divide the applied voltage, 100 volts, by the total resistance to get the current.

  • Physics. -

    I got it like this :
    two in parallel are equal to 15*20/35 = 8.57 ohms
    that in series with 5 ohms gives you 13.57 ohms

    I = E/R = 100/13.57 = 7.37 amps total current.

    voltage across parallel combo is E = IR = 7.37 x 8.57 = 63.1 volts
    current through 20 ohms, I = E/r = 63.1/20 = 3.15

  • Physics. -

    Yes, you're right! I missed the last part that stated "through the 20.0 resistor".
    Sorry about that

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