Electronics > Beginners
Beginners idiot question
magic:
--- Quote from: Zero999 on May 27, 2019, 09:21:16 am ---Only if it's a superconductor.
--- End quote ---
OP is asking about simulation, not real cables.
--- Quote from: Zero999 on May 27, 2019, 09:21:16 am ---Simulators always assume the resistance between ground connections is lower than the wires, which also confusingly have zero resistance. [...] SPICE considers the ground nodes first, so if they're connected together with other wires, then the current in those wires is assumed to be zero.
--- End quote ---
Maybe that's what SPICE does but OP sees exactly the opposite behavior.
It's irrelevant either way, it's just a simulation of "ideal" components which don't exist so it doesn't need to make sense.
ArthurDent:
Mr D
--- Quote --- Ok, so am i right in thinking that in these circuits / discussions, the word "ground" could be replaced with "the negative terminal of the battery"?
--- End quote ---
The replies to this topic are starting to make the question far too complicated. This is like when a young child asks: “where do babies come from?” and the parent goes into a very long and uneasy sex-ed explanation when all the child wants is: “the hospital”.
There are lots of circuits that have absolutely no ground, or earth, or whatever you want to call it. An automobile is isolated from ground by the tires, an airplane in the air has no ground connection, and a space station has no connection to ground when in orbit. To check or troubleshoot the circuitry in each of these examples you have to choose a somewhat arbitrary point of reference if you are going to describe the voltages at various points in the circuit to others.
If someone asks: “what is the voltage at B?” you have to ask: “with respect to what?” When you ask. above, whether to use “ground” or “the negative terminal of the battery”, both are not the answer, it is "the reference point specified". Check the link below for a better explanation.
http://www.tpub.com/neets/book1/chapter3/1-18.htm
Macbeth:
OP should just breadboard (who even needs a breadboard for such a simple circuit?) and use the cheapest crappiest DT830 or other meter possible and figure it out for himself. :horse:
Brumby:
:palm:
The Op has not expressed any difficulty with circuit operation - just the way it is being represented by the simulator he is using. His comment about current sharing through the common wire and the ground connections demonstrates he has a reasonable grasp of what to expect in a real circuit - it's just that the simulator isn't showing that:
--- Quote from: Mr D on May 26, 2019, 09:13:57 pm ---.... But what i don't understand is why EC shows the current only flowing through the bottom horizontal wire.
If the grounds are connected (as proved by the circuit on the left), then the current should flow just as happily through this ground bus, right?!
So i'd expect, all other things being equal, that we'd have 50% of the current flowing through the bottom horizontal wire, and 50% through this real or virtual ground bus!?
--- End quote ---
Brumby:
For the benefit of the Op, maybe it's time to roll this out again.....
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