I've been using different power supplies for 6 years. But, I'm unable to understand how we make ground in a Power supply? Or from where does this ground come? Or from where does this reference ground come? Is it reference to earth or what?
How is Ground in a Power Supply made
groundpower
Related Solutions
The lowly NAND gate has a pin called GND and there's no reason to suppose it must be connected to: -
- Ground,
- Earth,
- Chassis,
- 0V or
- Common
I don't believe there is standard usage other than in protective earth points: -
Because the supply is floating, and you only made one measurement at once.
Floating means isolated, which means the resistance between the supply and ground is very very high. So high that the 10 Mohm input resistance of your multimeter is almost a short circuit in comparison.
simulate this circuit – Schematic created using CircuitLab
If you were to make both measurements at once, with identical meters, you would find V- at -6V and V+ at +6V with respect to ground, and 12V of course between V- and V+.
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Best Answer
As was clearly stated by EM Fields, "ground" is the reference against which voltages are measured against. Furthermore, in an isolated electrical system, such as a battery powered circuit, one might tie the positive terminal to "ground" and then all voltages measured against "ground" will be negative. Ground is simply a reference, nothing more.