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Dictionary of Electrical Engineering
Commonly used terms in the Electrical industry.
- earth electrode system
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a network of electrically interconnected rods, plates, mats, or grids installed for the purpose of establishing a low-resistance contact with earth. The design objective for resistance to earth of this subsystem should not exceed 10 Ω.
- earth wire
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an overhead wire which is maintained at ground potential for purposes of lightning shielding and system grounding.
- earthing
- See grounding
- economic dispatch
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a generation scheme in which units are utilized such that the greatest profit is generated for the utility.
- economic interchange
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an arrangement between interconnected electrical power systems whereby a system can meet its load demand by buying power from one or more of the other systems in the interconnection group.
- eddy current
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a circulating current in magnetic materials that is produced as a result of time-varying flux passing through a metallic magnetic material.
- eddy current brake
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a braking device in which energy is dissipated as heat by generating eddy currents.
- eddy current drive
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a magnetic drive coupled by eddy currents induced in an electrically conducting member by a rotating permanent magnet, resulting in a torque that is linearly proportional to the slip speed.
- eddy current loss
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the energy wasted in sustaining undesirable eddy currents in an electrical conductor.
- efficiency
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(1) the ratio of the input power to the output power. It is a figure of merit for the energy cost effectiveness of a device.
(2) in antennas, the ratio of the power radiated to the input power. This term is sometimes defined with the mismatch loss (1-γ2) included in the total efficiency of the antenna; other times, it is omitted from the calculation.
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