1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Resistors in Parallel!

  1. Feb 26, 2007 #1
    1. Ten 110-ohm lamps are connected in parallel to a 110-V house line. A) What is the combined resistance of the ten lamps? B) What current flows in the line when all ten lamps are operating? C) What power is then being supplied to the circuit by the line?

    I just wanted to have someone check my work and see if I attacked this problem the right way.




    2. 1 / Rt = 1 / r1 + 1 / r2...... (total resistance for resistors in parallel)
    V = IR
    P = VI




    3. A) This is simple: add (1/110) ten times, giving (1/11).. Then cross multiplication can be used to find that Total resistance is equal to 11 ohms

    B) To find the current that flows in the line, we can use ohms law and substitute 110 volts = 11 ohms * I, and I will evaluate to 10 amps

    C) P = (110 volts)(10 amps) = 1100 right?
     
  2. jcsd
  3. Feb 26, 2007 #2
    Looks good to me.

    ~Lyuokdea
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook




Loading...