How is something “grounded” (electricity) even though it might not be touching the ground?



I’m thinking the connections in Bluetooth speakers for example or pickups on a guitar. In particular I know audio ports typically have a left/right and a ground wire but if this is in a portable Bluetooth speaker that you’re holding how does the ground work in this case?

In: Physics

It uses a battery just like any electronic device. The battery has a positive and negative side. The negative side serves as “ground” DC electricity is different than AC which it what’s used in your house. AC electricity is connected to the ground through wiring.

the ground wire will typically tie into the greater structure of the item.

Even if something isnt touching the ground, the structure of it itself has a pretty decent ability at absorbing and dispersing, to an extent, electrical charge.

For example, when you’re jump starting a car. you attach the two positive terminals on the batteries together, and you attach the negative terminal to the “ground”, or any bare piece of metal in the car.

This is to help prevents sparks because the metal of the car itself can soak up a fair amount of electrons if it needed to.

Grounded simply means connected to a large enough pool of neutral atoms. Earth ground is obvious very good since there’s a lot of contiguous matter to act as a pool, but in order for something to be grounded it only needs to be connected to some object that can successfully drain off excess charge buildup.

Electrical ground and neutral are the same thing.

1. But it is directly required only in connections to high energy appliances like fridge, air conditioner, microwaves etc. plugged through the 110V or 220V supply.

2. Other devices like speakers or mouse, that have batteries, don’t have enough energy to give shocks (to people), thus their supply doesn’t have neutrals.

3. Although the small devices with batteries cannot hurt humans, the battery levels are very dangerous for the circuits, because they operate at mV or microvolt levels. Therefore, the Printed Circuit Board (PCB) designers pay special attention to make sure there is a common ground that connects all components. This is necessary to prevent the damage to circuit and the components in case of excess power supply from the source (battery).