in alternating current whats the use of grounding?

Question

all houses and electricity poles have this.

Answer 1

It's true that AC has a "neutral" wire that is already grounded at the transformer that reduces the voltage to 115V AC. However, the neutral still carries the full current of the appliance. That means that the further away from the transformer you are, and the more current the appliance draws, the higher the voltage on the neutral will be. This is due to Ohm's law V=IR, where I is current and R is the resistance of the neutral wire from appliance to transformer. As a precaution, the metal housing of high current devices is grounded so that if either live or neutral touches the housing, you won't get shocked.

Answer 2

The simple answer is that it acts as a safety outlet.

Also on a 220 line if you run just one line to the ground you will get 110 volts.

If there is a break or hole in the insulation it lets the current carry away down the wire more than it will if a person touches it or it tries to short through something else.

Ungrounded AC is risky and leads to many cases of electrical shock each year.

Also, surge protectors and lightning blockers cannot function properly if you don't have a ground.

That is why those 3 prong to 2 prong adapters are considered a safety hazard.

Answer 3

in our country we use 220 volts instead of 110/120 volts and sometimes the distribution transformer (those big cans atop the electrical posts) is center tapped with respect to ground (if you place one probe of an AC voltmeter to one of the lines in a wall outlet, and the other probe to any grounded wire or metal, like a deep well water pipe, you will get a 110 volts reading, same with the other line.) this is a convenient way of using 110 volts electrical appliances in a 220 volts wiring without using a stepdown transformer.

Answer 4

Ground wire is usually connect to metal body of the appliances.If there is a leakage in the appliance, we won't get shock because body is grounded which potential is lower than our body.Electricity is like a rain water, always look for the lower point to go.If the ground connection is no good,there is another protection called ELCB or RCCB to cut off the electrical supply.Usually, when the appliance has leakage ELCB or RCCB will cut off the power.
Hope this will help.

Answer 5

Simple
Sumtimes the wires are not insulated properly
so we hav a chance of getting a shock if we touch that wire???
but y do we get that shock because for the current to lose its effect it needs a medium of very high resistivity (the ground)
therefore instead of us sending it into the ground there is a neutral termina which has a wire which collects the leaked electricity and sends it into the ground.