In the world of electronics, the entire world shares the same ground! All circuits have ground and that ground goes to Earth. Therefore, it’s easy to conclude that all circuits are joined together.
But it's not that simple.
It is generally safe to say that plug-in electronic devices like PCs, TVs, and standard home appliances share a common ground, particularly when they are connected to the same electrical system. This shared ground is typically established through the electrical wiring in a building, where the ground wire is connected to the Earth, providing a reference point for all devices plugged into the same outlet or circuit.
When devices are plugged into the same power supply, they often share a common ground reference. This means that the ground potential is the same for all devices connected to that power source, which helps in maintaining consistent voltage levels across the devices.
Sharing a ground can be beneficial for safety, as it helps prevent electrical shocks and provides a path for fault currents. However, it can also introduce issues like ground loops, where differences in ground potential can lead to noise and interference in signals. This is particularly important in sensitive electronic systems where signal integrity is crucial.
While many devices share a common ground, there are instances where isolation is necessary, especially in sensitive applications like medical equipment. In such cases, devices may have isolated grounds to prevent interference and ensure safety.
Many devices, especially those connected to main power, have a physical connection to the Earth, portable devices like cell phones operate differently. Cell phones do not have a direct connection to Earth ground. Instead, they utilize a floating ground system. This means that the ground reference in a cell phone's circuit is not tied to the Earth but is instead defined by the circuit itself. The negative terminal of the battery often serves as this reference point, effectively acting as a common ground for the various components within the device
The floating ground in cell phones allows for greater flexibility and safety in design. Since these devices are battery-operated and not connected to a fixed power source, they can function independently without the need for an Earth connection. This design choice helps to avoid potential issues related to ground loops and interference that can occur in devices with a direct Earth ground
https://en.wikipedia.org/wiki/Ground_(electricity
https://www.circuitbasics.com/grounds-grounding-and-earth/
http://www.learningaboutelectronics.com/Articles/Why-does-a-circuit-always-have-to-have-ground
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