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You connect the housing of metallic electric appliances to earth ground so that, if an internal fault, such as a wire breaking loose and touching the housing, were to occur, then the housing would not become an electrocution hazard. This connection to earth ground is also accompanied with the neutral return being connected to earth ground at the distribution panel so that this internal fault causes high current in the circuit, with the result that the protective device (fuse or circuit breaker) trips.

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Why are power systems earthed or grounded?

Earthing is an important safety feature and most electrical appliances have a third earth wire separate from the two current-carrying wires, the live and neutral. The earth wire is used to connect all the outer metal parts of all appliances to one common point which is also connected to the gas and water pipes and to an earth rod. That means that users will not receive a shock by touching different appliances, and it also prevents the build up of a static electric charge on equipment cases.


What is the importance of the erth wire in electricity?

The earth wire is crucial for electrical safety as it provides a path for excess electrical current to safely dissipate into the ground in the event of a fault, such as a short circuit. This helps prevent electric shocks and reduces the risk of electrical fires. By ensuring that metal casings of appliances remain at earth potential, it protects users from accidental electrocution. Overall, the earth wire is a vital component in ensuring the safe operation of electrical systems.


What is the third terminal on electric equipment?

The third terminal connects to earth ground.


If magnetic compass does not work on moon Why electric motor work on moon?

No because the Moon does not have a magnetic field like the Earth does. The Earth's magnetic field appears to be created by a liquid metalic out core circulating around a solid core. This works like a dynamo which creates the magnetic field around the Earth. The Moon lacks a similar core stucture. This is also the reason why the Monn has no atmosphere.A magnetic compass would not work on the moon, for the moon does not have the magnetic field that the earth has, allowing us to use this device.No, because moon does not have magnetic force like earth


Why the high resistance earth fault in the appliance increase the risk of electric shock when using appliance in earth situation?

If the earth connection has a high resistance it is not capable of acting as a true earth. For example, the high resistance might mean that the fuse or circuit-breaker will fail to operate when there is a fault.

Related Questions

Why third pin is plastic in 3 pin plug?

Double-insulated electrical appliances, such as electric drills, only require two connections -a line and a neutral- to the supply. An earth (ground) connection is unnecessary. In the UK, all electric socket outlets have shutters that blank off the line and neutral terminals when there is no plug inserted. These shutters are operated by the earth pin of the plug. As double-insulated appliances don't require an earth connection, a plastic earth pin is moulded into the plug in order to open the socket shutters in place of a normal metallic earth pin.


Why is it essential to earth electrical appliances having metallic body?

if the appliance shorts out (if one or more of the wires inside it come into contact with the outer casing) the electricity will take the shortest route to be neutralised. If there is no earth wire and you touch the shorted out appliance then the shortest route to neutralise the electric charge is through you, and you will be electrocuted. If an earth wire is present then the shortest route to neutralise the current will be through this wire, so you would not be electrocuted if you touched the shorted out appliance.


Why is grounding necessary in areas which can produce electro static discharge?

To carry the static charges straight down to earth thus safeguarding your appliances.


What the liquid metallic region of the earth?

The metallic region is between the inner and outer core of the Earth; contain iron and nickel.


What are the properties and applications of non-metallic magnets?

Non-metallic magnets, also known as ceramic magnets, are made from materials like ferrite or rare earth oxides. They are brittle and have low magnetic strength compared to metallic magnets. However, they are resistant to corrosion and can operate at high temperatures. Non-metallic magnets are commonly used in applications such as electric motors, speakers, and magnetic separators.


What is the metallic core?

The metallic core refers to the central portion of a planet or celestial body that is composed primarily of metal, such as iron and nickel. In the case of Earth, the metallic core is divided into the inner core and outer core, with the inner core being solid and the outer core being liquid. The metallic core plays a crucial role in generating Earth's magnetic field.


Which is the softest metallic mineral on earth?

Graphite


Why are power systems earthed or grounded?

Earthing is an important safety feature and most electrical appliances have a third earth wire separate from the two current-carrying wires, the live and neutral. The earth wire is used to connect all the outer metal parts of all appliances to one common point which is also connected to the gas and water pipes and to an earth rod. That means that users will not receive a shock by touching different appliances, and it also prevents the build up of a static electric charge on equipment cases.


Do all appliances need to be earthed?

earth wire will be connected to the part of appliance body at such a place which is in contact with earth (ground), so as to pass on the voltage into ground to make a big resistance to blow the fuse system behind, and to safe guard the user or human/animal from electric shock, if there is any leakage of current from appliance. K. S. Verma The earth wire should be connected to the outside case that comes in contact with people. That means that if live parts inside the device become connected to the case in a fault condition, enough current will flow to blow the fuse, instead of becoming dangerous to the users.


What is chormium?

It is a metallic element found in the earth's crust


Why is an earth wire connected to metalic parts of appliances?

The ground connected to metal parts ensures that no voltage potential can exist on the metal part where it could shock the user of the device. If the hot wire does touch the metal case because of some fault in the device the breaker will trip or the fuse will blow that protects the circuit.


What does electric current will flow through the earth wire mean?

Insulation failure in an electrical equipment will cause some amount of current, depending upon the severity of fault flows through the metallic body and then through the earth wire which is connected to the body.