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Potential of earth is assumed
Zero
Infinite
Very high
None of this
Zero
In electrical engineering and physics, the Earth is defined as the universal reference point for electrical potential. By convention, the potential of the Earth is considered to be zero volts due to its effectively infinite size and charge-carrying capacity.
In electrical engineering and physics, the Earth is defined as the universal reference point for electrical potential. By convention, the potential of the Earth is considered to be zero volts due to its effectively infinite size and charge-carrying capacity.
V=CQтАЛ тАФ Relation between potential, charge, and capacitance
limCтЖТтИЮтАЛCQтАЛ=0 тАФ Mathematical limit for Earth potential
The Earth acts as a massive conductor capable of accepting or supplying an almost limitless amount of charge without a significant change in its own electrical potential. Because V=CQтАЛ and the capacitance (C) of the Earth is effectively infinite, the potential (V) remains constant at zero regardless of the charge transfer. This makes it the ideal reference node for defining potential differences in circuit analysis and safety earthing systems.
Earth serves as a zero-potential reference (datum) for all electrical circuits.
Earthing/Grounding ensures safety by maintaining equipment chassis at zero potential relative to the ground.
The vastness of Earth allows it to absorb fault currents without raising its own potential.
Provides a stable reference for voltage measurements.
Enables safe dissipation of fault currents during short circuits.
Protective Earthing (PE) for human safety.
System Grounding in power distribution networks.
Reference point in signal processing and PCB layout.
The potential of Earth is technically 'equipotential', but for circuit calculation purposes, it is fixed at 0V.
Option B (Infinite) is incorrect as potential cannot be infinite while maintaining a stable reference. Option C (Very high) is incorrect as it would cause dangerous sparking.
A is correct тАФ The Earth is defined as an equipotential body with a reference potential of zero volts.
In any circuit calculation where a terminal is marked as 'grounded', always substitute V=0 at that node to simplify your nodal analysis equations.