Difference between Earthing and Grounding

The key difference between earthing and grounding is that the term “Earthing” means that the circuit is physically connected to the ground which is Zero Volt Potential to the Ground (Earth). Whereas in “Grounding” the circuit is not physically connected to ground, but its potential is zero with respect to other points.

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What is the Difference between Earthing and Grounding?

Earthing:

Earthing can simply be defined as the process of protecting against unwarranted spikes and bouts of electricity that can cause damage to life and property. Therefore it is important to remember these key differences between the two. One needs to understand that they both are referring to the same process. A deeper understanding of electric potential can prove useful in this method.

Grounding:

Grounding is similar to Earthing, by which insulation against accidental currents is achieved. The main live wire is connected to a power supply to power an appliance, however, the other portion of the wire is led under the earth. This is done in case of an accidental cut in the circuit, to avoid overloading and other dangerous side effects.

Earthing VS Grounding

Earthing
Grounding
This method protects the human being from electrocuted. This method protects the entire power system from malfunctioning.
Earthing contains zero potential. Grounding does not possess any zero potential.
The earth wire used is green in colour. The wire used for grounding is black in colour
Earthing is primarily used to avoid shocking the humans. Grounding is primarily used for unbalancing when the electric system overloads.
Earthing is located under the earth pit, between the equipment body underground. It is located between the neutral of the equipment being used and the ground.

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The magnitude of the focal length of a diverging less is 20 cm. What is the power of this lens?