Theoretical question

[dimmer]

A current using piece of equipment only take the power it needs from the supply voltage. ( assuming not fault)

So for example you had a light bulb. 100W

It was feed from one 230 v supply it would take all the power it needed from that supply to work correctly

So 100/230 = 0.4 A

Now say the same bulb was fed from two different 230 v supplies, would it pull 0.2 A from each supply

So you could not overload a piece of equipment if the supply is 230 and it was designed for 230

I hope that makes sense.
Thanks

 

[Mursal]

When you model the complete circuit, the power source whether its a battery or generator will have an internal resistance.

If the internal resistance of both supply's are identical, then yes, 0.2A from each (Kirchhoff's current law) If there is the slightest difference, the current flow from each one, will be different. Both added together will always equal 0.4A (Ohms law).

We can do the figures if you want, but that's the bones of it.

 

[JohnW2]

When you model the complete circuit, the power source whether its a battery or generator will have an internal resistance.
If the internal resistance of both supply's are identical, then yes, 0.2A from each (Kirchhoff's current law) If there is the slightest difference, the current flow from each one, will be different. Both added together will always equal 0.4A (Ohms law).
We can do the figures if you want, but that's the bones of it.

Indeed, with the added comment that, if the two 230V supplies (I assume 'in parallel') were AC, it would be crucially important that they were perfectly 'in phase'with one another - otherwise, quite apart from the consideration of current division between them, something nasty might happen (to the supplies)!

Kind Regards, John