# Ac current flow

#### aamirali

Joined Feb 2, 2012
412
I have connected a leg of bulb with ac voltage source & connected other leg to wall of my room which might be from earth. Bulb glows.
Now my question is ac current flow in one direction during +ve half & during -ve half in reverse direction or more specifically electron flow in opposite direction. (attached is page.pdf)

So when conventional current flows during +ve cycle that means electron flows in opposite direction i.e from earth to voltage source.
How can this happen, electron comes via earth

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#### crutschow

Joined Mar 14, 2008
34,715
Earth is just the common return line (all earth connections are connected together) for the AC current. So the electrons flow out of the generator to ground and the back out of the ground to the load. Nothing is created or destroyed.

#### MrChips

Joined Oct 2, 2009
30,988
Electrons can travel in either direction.

#### aamirali

Joined Feb 2, 2012
412
How can electrons flow out of earth.
I haven't connected other leg to neutral. If bulb is connected b/w line & neutral. It can be understood.

But earth is something different. Yes it is considered a zero potential. But how can electron flow out of earth.

#### t_n_k

Joined Mar 6, 2009
5,455
In the interests of ensuring your ongoing safety what AC voltage level are you doing this with?

#### aamirali

Joined Feb 2, 2012
412
220V ac connected to bulb

#### mcgyvr

Joined Oct 15, 2009
5,394
The neutral is bonded to ground at the service/distribution box.

#### t_n_k

Joined Mar 6, 2009
5,455
I'm surprised that no-one (myself included) cautioned the OP concerning the risk involved in their experiment with the light globe and 220Vac.

Presumably some caution was exercised by the OP, but the prospect of someone with a wire in hand connected through a light globe to active 220Vac wandering over to a "wall" and testing continuity to the building frame somewhat bemuses me.

#### Mark_T

Joined Feb 7, 2012
47
Electrons are in all things, even your wall. There can be capacitive effects also to complete the circuit.