Voltages

105

01:19:10

I still find this weird everytime I see this in action...

published 11 years ago

nikis

11 years ago

Чо

faceblast

11 years ago

what's weird about it

faceblast

11 years ago

voltage is just potential, and current is the fulfilment

cjdelphi

11 years ago

How do I define gnd on breadboard? The only difference on these 2 circuits is where ground is placed right?

thebugger

11 years ago

All I see is ohm's law :D

Mamish

11 years ago

The only reason EC requires it is to have a reference point for calculations. So the voltages here are either +5/-5 or 10/0 but either way the resistor still has a relative 10V across it so the circuits work the same way (which is also why current readings aren't affected by where the ground is). You want to put the ground where it'll give you the most useful info, e.g. if you made a bridge AC-DC converter you'd want to place it on the negative of your output instead of slapping it on the AC neutral like most people do, so you can actually read the useful output voltage.

Mamish

11 years ago

For real life construction you usually don't have to worry about grounding issues unless you're playing with mains or something. For floating supplies like batteries it's an abstract concept.

wyoelk

11 years ago

Right on Mamish! Every circuit has to complete a path back to origin. Power plant generators are grounded to earth to allow the circuit to complete from a residence to the plant. See Tesla v. Edison, they even agreed on that point. So the bigger the source of power and load, the bigger the ground/neutral/return to complete the circuit must be.

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