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: Ohm's law

  1. Feb 4, 2008 #1
    I need help with this question... The manufacturer of a 12V car headlight specifies it will draw a current of 6A. You would like to check this claim with an ammeter designed to measure currents up to 10A and having a resistance of 0.1 Ohms. Which of the two figures below represents a circuit where the ammeter correctly measures the current in the headlight?

    Attached Files:

  2. jcsd
  3. Feb 5, 2008 #2
    The diagram shows an voltmeter, not an ammeter ... ?

    Ignoring that (assuming the voltmeter is an ammeter) what are your thoughts on the question?
  4. Feb 5, 2008 #3
    just read your textbook, or use Google..

    if you cant answer this by yourself you haven't made any effort.
  5. Feb 5, 2008 #4


    User Avatar
    Homework Helper

    Uhm....Voltmeters and ammeters are different things. But taking that the voltmeter is an ammeter. How do junctions affect currents and pd's ?
  6. Feb 5, 2008 #5
    Maybe he meant to put a 0.1 Ohm shunt across the Voltmeter. That turns it into an ammeter.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook