What is a ground? What is a happening to need a ground?
In: Physics
Ground is your reference voltage and is always at zero. All voltages in a system are measured relative to their ground.
There are many types of electrical ground. There’s EGnd or Earth Ground which eventually ties back to a long metal pole driven into the ground. There’s DGnd or digital ground which the digital signals in a system will be referenced against. There’s AGnd or Analog ground which the analog signals will be referenced against
Your USB phone charger has a couple pins in the USB cable referred to as Ground. They’re completely isolated from the metal rod that provides Earth Ground for the outlets in your house, they’re just ground for the USB power and data signals.
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