Ground is always considered at 0 Volt?

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SUMMARY

The discussion confirms that ground is conventionally considered at 0 volts in electrical circuits. A bulb will not glow if both terminals are connected to the same voltage, as there is no potential difference to drive current flow. However, if one source provides 15 volts and another 5 volts, the bulb will glow due to a potential difference of 10 volts. The concept of ground can be defined at any voltage level, but it is most practical to use 0 volts for reference.

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ground is always considered at 0 Volt?
Will this bulb glow and why?

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No as there is no potential difference to allow current to flow.
 
hi otomanb
Welcome to PF :)

Generally yes its the 0V.

umm just trying to decypher your diagram it appears to show the 2 positive terminals connected to the lamp and the 2 negative teminals connected together.

In this case the lamp WONT glow as there can be no current flow

cheers
Dave
 
your actual subject question doesn't have anything to do with the
circuit diag you have posted and the question you asked about current flow
the 2 questions are not related :)

Dave
 
and if one source offers 5 volt and other offers 15 volt ? will bulb glow?
because now there is a potential difference as it's called voltages!
 
Last edited:
Yes, because there is a potential difference then.

Ground can be any voltage you like as long as you state all other voltages relative to ground. So you could call ground 100V and state all the other voltages relative to this if you wanted... there just isn't much point in doing so.
 
because i tested this thing with a software livewire 1.1 . the bulb glows if one battery provides 15 v and other 5v. And as there is a difference of 10 volts.
 

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