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!

AC In houses

  1. Oct 30, 2007 #1
    My Question is this-

    We get AC supply to our houses, So for the first half cycle the current should from thro
    the live wire to the load and then return thro neutral, Now for the 2nd half cycle this
    must be reveresed, That is Neutral-load-Phase. This is wat is Alternating current.
    But I closed the switch, inserted the tester in the live terminal and it glowed, jus as
    expected,then i inserted the tester into the neutral and it didn't glow.How's that?
    Now if the neutral wire acts only as the return wire and v get current only thro the
    phase terminal from the generating stations how can v cal that as alternating current, becaus
    the current is uni-directional.

  2. jcsd
  3. Oct 30, 2007 #2

    Shooting Star

    User Avatar
    Homework Helper

    The potential of the live wire cycles from positive to negative. When a simple appliance, a light bulb say, is connected between the live and the neutral, the direction of the current also changes from positive to negative cyclically across the load. So, it's not unidirectional, but only the potential of the live wire is changing periodically. The neutral wire remains at a constant (zero) potential.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook