Thursday, March 19, 2009

Letter E

Effective Value
A measure of the amplitude of alternating current or voltage.
Also called the root-mean-square or RMS value. Test meters
used to measure alternating current or voltage usually display
effective values.

EEPROM A type of semiconductor memory often used for storage of
data or programs that change less frequently than rand access memory. The contents of EEPROM chips are erased with electrical pulses rather than with ultraviolet light as with erasable programmable read only memory. EEPROMs retain
their contents when power is turned off.

Enclosure
A protective housing. Guidelines for various types of
electrical enclosures are provided by the National Electrical
Manufacturers Association (NEMA). and International
Electrotechnical Commission (IEC).


Encoder
Often refers to a digital device that provides angular position
information. Some encoders provide this information as
incremental pulses as position changes. Other types of
encoders provide a digital signal representative of absolute
position.


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