Electric current

Discussion in 'General Electronics Chat' started by akifnadeem, Oct 28, 2010.

  1. akifnadeem

    Thread Starter Member

    Apr 9, 2010
    15
    0
    if there is a wire comprising of two parts of different cross sectional area and of same material, would current remain same in this wire?? let say A1 = 5m,A2=7m
    are two areas of a single wire. let say we provide the current of 5A, wud it b same in the wire..??
     
  2. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    Theoretically, yes.

    Depending on resistance of wire, the load may see less voltage, overall drawing a bit less current. Hence the use of heavier gauge wires for long runs that will be carrying high current.

    A Heavy wire spliced to a smaller wire will still carry a good deal of current, but the smaller wire will create a voltage drop, dissipating the energy as heat.
     
  3. DonQ

    Active Member

    May 6, 2009
    320
    11
    Didn't say if the two different wires are in series or parallel! Very different answers.

    Also, saying that an area is 5m has the wrong units. Is the radius/diameter 5m or is the area 5 m^2 ?
     
  4. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718

    Good point. If the two wires are run parallel, they will each carry a portion of the current, the one with the lowest resistance carrying the majority, the balance in the other.

    The units didn't seem correct to me, either, so I ignored them as a typo, which could have been a mistake to understand the actual question.
     
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