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Thread: How current flow

  1. #1 How current flow 
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    I would like to ask:

    1.Is electricity travelling to the ground at the picture and if it is why are the circuits grounded(doesn't it mean electricity is lost?)
    imgur: the simple image sharer (sorry I tried to upload picture directly but it fails every time)
    -In case it is not travelling to the ground - why it's not?(ground is connected to the wire)

    2.When I touch electric line while I am isolated from the ground is some electricity still travelling through me from line?


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  3. #2  
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    Electrons travel from negative to positive. Usually ground is used as the negative.
    In that circuit I suspect they are showing a chassis ground but even if it is an earth ground it makes no difference.
    If you grounded the negative side of the load you should be able to complete the circuit through the ground and cut the wire between the negative and the load.

    Edit. First of all do not touch live circuits

    So long as you are not part of the circuit and are not creating a short (making a new circuit) no current should flow through you.

    Electricians have said you should keep one hand in your pocket when working with live wires. The idea is that it would prevent you from creating a short circuit through your heart by touching a live wire while holding onto a ground.


    Last edited by dan hunter; August 2nd, 2014 at 02:25 AM. Reason: bit should have been but
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  4. #3  
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    Quote Originally Posted by fghf76 View Post
    1.Is electricity travelling to the ground at the picture
    No, no current flows.
    and if it is why are the circuits grounded(doesn't it mean electricity is lost?)
    No electricity is lost. Grounds are used for ease of analysis and safety.
    -In case it is not travelling to the ground - why it's not?(ground is connected to the wire)
    There is no path from ground back to any other part of the circuit. Therefore no current flows.
    2.When I touch electric line while I am isolated from the ground is some electricity still travelling through me from line?
    DC - no. You almost instantly reach the same potential as the line, and from that point on no current flows.
    AC - sometimes. Since there is a virtual ground between you and "real" ground due to your capacitance, some current can flow. This is not an issue at 60Hz but can be an issue at higher frequencies.
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  5. #4  
    Forum Professor jrmonroe's Avatar
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    Quote Originally Posted by billvon View Post
    There is no path from ground back to any other part of the circuit. Therefore no current flows.
    Good point (emphasis mine).

    Fghf76, when you see the word circuit, it is related to the word circle. In almost every kind of circuit, the electrons leave the source of power, travel around the circuit, and return to the power supply. If they can't return to the power supply, the current will not flow.

    In this sense, the current acts more like a so-called "serpentine belt" that powers various equipment on a car's engine.



    Imagine if this was not so (that is, if electrons would flow without needing a circuit) ... as soon as a battery is made, electrons would simply pour out from one of its ends, like a bucket of water with a hole in it.

    Grief is the price we pay for love. (CM Parkes) Our postillion has been struck by lightning. (Unknown) War is always the choice of the chosen who will not have to fight. (Bono) The years tell much what the days never knew. (RW Emerson) Reality is not always probable, or likely. (JL Borges)
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  6. #5  
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    Quote Originally Posted by fghf76 View Post
    I would like to ask:

    1.Is electricity travelling to the ground at the picture and if it is why are the circuits grounded(doesn't it mean electricity is lost?)
    imgur: the simple image sharer (sorry I tried to upload picture directly but it fails every time)
    -In case it is not travelling to the ground - why it's not?(ground is connected to the wire)

    2.When I touch electric line while I am isolated from the ground is some electricity still travelling through me from line?
    Current flows because positive energy is stronger than negative energy! In order for change to occur there must be a past and a future (negative and positive).*
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  7. #6  
    Genius Duck Moderator Dywyddyr's Avatar
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    Quote Originally Posted by JeffreyWhittaker View Post
    Current flows because positive energy is stronger than negative energy! In order for change to occur there must be a past and a future (negative and positive).*
    Stop it.
    Go get an education.
    "[Dywyddyr] makes a grumpy bastard like me seem like a happy go lucky scamp" - PhDemon
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  8. #7  
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    Quote Originally Posted by JeffreyWhittaker View Post
    Current flows because positive energy is stronger than negative energy! In order for change to occur there must be a past and a future (negative and positive).*
    Well - no. Actually, to paraphrase Pauli, that's not even coherent enough to be wrong.
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