How does electrical ground work? Why does electricity want to travel to the earth, which doesn’t seem particularly conductive?

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Some additional questions I have to further understanding:

Ships don’t have ground, but why couldn’t electricity on a ship ground to the ocean the same way houses ground to the earth?

A structure will have a grounding rod dug into the earth. Does the dirt, soil, and rock composition that the structure is built on affect how willing current is to use the path?

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30 Answers

Anonymous 0 Comments

Ever hear the expression “I don’t have to outrun the bear, I just have to outrun you”?

If an electrical device shorts in a dangerous way, the *wired* connection to ground is a more attractive path than the *you* connection to ground. It’s going to ground other way, just a matter of the path it takes.

Also, you say Electrical Ground but your question seems to be about Earth Ground, which is probably why none of the other answers touched on this explanation. They are not the same thing, though they are often connected together. And regarding the ship question, they use Chassis Ground which serves basically the same purpose as Earth Ground but isn’t as good.

Anonymous 0 Comments

Ever hear the expression “I don’t have to outrun the bear, I just have to outrun you”?

If an electrical device shorts in a dangerous way, the *wired* connection to ground is a more attractive path than the *you* connection to ground. It’s going to ground other way, just a matter of the path it takes.

Also, you say Electrical Ground but your question seems to be about Earth Ground, which is probably why none of the other answers touched on this explanation. They are not the same thing, though they are often connected together. And regarding the ship question, they use Chassis Ground which serves basically the same purpose as Earth Ground but isn’t as good.

Anonymous 0 Comments

>Ships don’t have ground, but why couldn’t electricity on a ship ground to the ocean the same way houses ground to the earth?

Ships ground to the hull. Either electrolysis or galavanic reactions will occur, which is why they are fitted with sacrificial anodes.

Anonymous 0 Comments

>Ships don’t have ground, but why couldn’t electricity on a ship ground to the ocean the same way houses ground to the earth?

Ships ground to the hull. Either electrolysis or galavanic reactions will occur, which is why they are fitted with sacrificial anodes.

Anonymous 0 Comments

We intentionally connect part of the circuits power source to “ground”, this is why electricity “wants” to go there. It’s a path back to the source. If we didn’t make that connection to ground then it wouldn’t want to go there.

Anonymous 0 Comments

The earth is very large and has many electrons in it, electricity with enough voltage will make the electrons flow.

Anonymous 0 Comments

We intentionally connect part of the circuits power source to “ground”, this is why electricity “wants” to go there. It’s a path back to the source. If we didn’t make that connection to ground then it wouldn’t want to go there.

Anonymous 0 Comments

The earth is very large and has many electrons in it, electricity with enough voltage will make the electrons flow.

Anonymous 0 Comments

Electrical ground is simply an infinite supply or dump for positive and negative charges. The physical ground is large enough that by plugging a wire into it that we can take or dump as many electrons as we need, which is how electrical ground got its name.

Ground can simply be a large piece of metal as long as the voltages you are dealing with aren’t extreme, but in a house or with a lightning rod, eventually it does go into the Earth because it’s there and it’s free.

Anonymous 0 Comments

Electrical ground is simply an infinite supply or dump for positive and negative charges. The physical ground is large enough that by plugging a wire into it that we can take or dump as many electrons as we need, which is how electrical ground got its name.

Ground can simply be a large piece of metal as long as the voltages you are dealing with aren’t extreme, but in a house or with a lightning rod, eventually it does go into the Earth because it’s there and it’s free.