Please check my work here:

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.

a)the voltage of the parallel circuit

b)the voltage across the parallel circuit

c)the current through the 10 ohm resistor

Ans: So for voltage of parallel circuit I took 180V/30 ohms = 6A. I multiplied that by 20 ohms that I had found by 1/r total = 1/30 + 1/60 = 20 ohms. So I got 120 V for voltage of the parallel circuit.

For voltage across the parallel circuit, I originally found 180V because I included the 60 V from the series. From what the tutors have said, this is the same problem as above one. Therefore, should my answer be 120 V instead of the 180V?

c) I used I = V/R = 60 V / 10 ohsm = 6 amps for the current through the 10 ohm resistor.

So I found: 120 V, 120 V again???, and 6A. Have I finally got it?

  1. 👍 0
  2. 👎 0
  3. 👁 101
  1. Nuts to your logic.

    voltage in the parallel branch is due to the effective resistance of the parallel branch x total current.

    effective resistance of parallel branch:
    20 ohms, your work is correct there.
    Total resistance: that 20 ohms in series with another 10, total 30 ohms.
    total current: 180/30=6amps (note this is not what you did).
    voltage on parallel branch: 20ohms*6amps 120 volts
    current through 10 ohm: 6 amps.

    Now your questions: what does a) mean? It makes no sense.

Respond to this Question

First Name

Your Response

Similar Questions

  1. physics

    A 15.0 Ohms resistor is connected in series to a 120V generator and two 10.0 Ohms resistors that are connected in parallel to each other. -What is the total resistance of the load? -What is the magnitude of the circuit current?

    asked by Rony on February 17, 2010
  2. physics, please help!

    (a) Find the current in each resistor of the circuit shown in the figure byusing the rules for resistors in series and parallel. (b) Write three independent equations for the three currents using Kirchhoff’s laws: one with the

    asked by Amber on November 28, 2012
  3. Physics (URGENT)

    Three wire-wound resistors have the following values: 30 ohms, 80 ohms, and 100 ohms. Each resistor has a voltage rating of 100V. If these three resistors are connected in series, can they be connected to a 240V circuit without

    asked by Anonymous on September 24, 2013
  4. Physics

    For what combination of parallel and series resistors will resistors of 25 ohms, 100 ohms, 50 ohms, and 50 ohms have a total resistance of 62.5 ohms?

    asked by Anonymous on May 12, 2018
  5. Physics

    A 5 ohms resistor is connected in parallel with the series assemvly of 2 ohms and 3 ohms resistors. The voltage drop across the 2 ohms resistor is 6V. What is the current through the 5 ohms resistor?

    asked by Lyn on April 21, 2019
  6. Physics

    Two identical resistors are connected in parallel across a 26-V battery, which supplies them with a total power of 9.8 W. While the battery is still connected, one of the resistors is heated so that its resistance doubles. The

    asked by Anonymous on February 12, 2015
  7. Algebra 2

    two resistors are connected in parallel. Their resistances are 8 ohms and 17 ohms. What is the resistance (R) of the combination? R=---ohms

    asked by chels on April 6, 2012
  8. Algebra 2

    two resistors are connected in parallel. Their resistances are 6 ohms and 10 ohms. What is the resistance, (R), of the combination? R=-----ohms?

    asked by Nancy on April 5, 2012

    two resistors of 25 ohms and 5 ohms respectively are connected in series to a 240V supply calculate the value of a third resistor to be connected in parallel with 25 ohms resistor so that the power dissipated shall be tripled

    asked by Kirchhoffs on September 25, 2017
  10. physics

    Resistors R1, R2, and R3 have resistances of 15.0 Ohms, 9.0 Ohms and 8.0 Ohms respectively. R1 and R2 are connected in series, and their combination is in parallel with R3 to form a load across a 6.0-V battery. -What is the total

    asked by Rony on February 18, 2010
  11. Physics

    I'm totally confused and this is due Monday- We're dealing with electrical circuits and I have to construct a circuit with resistors of 10 Ohms, 20 Ohms, 30 Ohms and 20 Ohms. The total resistance has to be 42 Ohms-Can someone

    asked by Aubrey on March 26, 2011

More Similar Questions