Turn on thread page Beta
    • Thread Starter
    Offline

    2
    ReputationRep:
    Hi all, I'm just wondering am I doing this question on my homework correct so far? I wasn't sure whether or not I should include the internal resistance of the battery when calculating the total resistance of the circuit. I don't include the resistance of the resistor at that point because the circuit leading to the resistor is broken, right? Thanks!

    Name:  IMG_1411.jpg
Views: 89
Size:  498.6 KB
    Offline

    10
    (Original post by Marcum)
    Hi all, I'm just wondering am I doing this question on my homework correct so far? I wasn't sure whether or not I should include the internal resistance of the battery when calculating the total resistance of the circuit. I don't include the resistance of the resistor at that point because the circuit leading to the resistor is broken, right? Thanks!

    Name:  IMG_1411.jpg
Views: 89
Size:  498.6 KB
    You must include the internal resistance.
    The 3 resistors (lamps) are in parallel.
    This is the external circuit.
    The combined resistance for these 3 is in series with the internal resistance of the cell.
    • Thread Starter
    Offline

    2
    ReputationRep:
    (Original post by Stonebridge)
    You must include the internal resistance.
    The 3 resistors (lamps) are in parallel.
    This is the external circuit.
    The combined resistance for these 3 is in series with the internal resistance of the cell.
    Ah, thank you! I got 1.68 Ohms for the total resistance, does that look correct to you?
    For the second question I did
    V=IR
    I =V/R
    I = 12/1.68
    I = 7.14 A
    Is that correct?
    Offline

    10
    ReputationRep:
    (Original post by Marcum)
    Ah, thank you! I got 1.68 Ohms for the total resistance, does that look correct to you?
    For the second question I did
    V=IR
    I =V/R
    I = 12/1.68
    I = 7.14 A
    Is that correct?
    Those are correct.
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: November 20, 2013

University open days

  • University of East Anglia
    UEA Mini Open Day Undergraduate
    Fri, 23 Nov '18
  • Norwich University of the Arts
    Undergraduate Open Days Undergraduate
    Fri, 23 Nov '18
  • Edge Hill University
    All Faculties Undergraduate
    Sat, 24 Nov '18
Poll
Black Friday: Yay or Nay?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.