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Earth Ground
A low impedance path to earth for the purpose of discharging lightning,
static, and radiated energy, and to maintain the main service entrance at
earth potential.
Eddy Current
Induced circulating currents in a
conducting material that are caused by a varying magnetic field.
Efficiency
The ratio of output power to input power,
generally expressed as a percentage.
Electrical
Degrees
One cycle of AC. power is
divided into 360 degrees. This allows mathematical relationships between the
various aspects of electricity.
Electromagnet
A magnet made by passing current through
a coil of wire wound on a soft iron core.
Electromagnetic
A magnetic field cause by an electric current. Power
lines cause electromagnetic fields which can interfere with nearby data
cables.
Electromechanical
A mechanical device which is controlled by an
electric device. Solenoids and shunt trip circuit breakers are examples of
electromechanical devices.
Electron
A negatively charged particle of matter.
Electrostatic
A Potential difference (electric charge) measurable
between two points which is caused by the distribution if dissimilar static
charge along the points. The voltage level is usually in kilovolts (volts
times 1000).
EMF
Electromotive force or voltage
EMI, RFI
Acronyms for various types of electrical interference:
electromagnetic interference, radio frequency interference.
Energy
The ability or capacity to do work.
ESD
Electrostatic Discharge (static electricity). The
effects of static discharge can range from simple skin irritation for an
individual to degraded or destroyed semiconductor junctions for an
electronic device.
Explosion - proof
Designed and constructed to withstand and internal
explosion without creating an external explosion or fire.
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