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physics - need help

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Resistors of 30 ohms and 60 ohms are connected in parallel and joined in series to a 10 ohm resistor.
The circuit voltage is 180 volts.

the voltage of the parallel circuit

the voltage across the parallel circuit

the current through the 10 ohm resistor

  • physics - need help -

    The two parallel resistors behave like a single serives resistor of equivalent resistance Req
    1/Req = 1/30 + 1/60 = 1/20
    So Req = 20 ohms

    The total circuit current is
    V/R = 180/(20 + 10) = 6 Amps

    The voltage drop is 60 V across the 10 ohm resistor and 120 V across the pair of parallel resistors. You seem to be asking the same question twice.

    All of the circuit current (6A) goes through the 10 ohm resistor

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