## Electronics (Mike Jaroch)

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### E

#### E-FIELD

Electric field that exists when a difference in electrical potential causes a stress in the dielectric between two points [11].

 Keyword(s): E-FIELD

#### E-TRANSFORMER

A special form of differential transformer employing an E-shaped core. The
secondaries of the transformer are wound on the outer legs of the E, and the primary is wound on the center leg. An output voltage is developed across the secondary coils when its armature is displaced from its neutral position. This device is used as an error detector in servosystems that have limited load
movements [15].

 Keyword(s): E-TRANSFORMER

#### E-TYPE T-JUNCTION

A waveguide junction in which the junction arm extends from the main
waveguide in the same direction as the E-field in the waveguide [11].

 Keyword(s): E-TYPE T-JUNCTION

#### ECHO

(1) The reflection of the original sound wave as it bounces off a distant surface [10]. (2) The RF signal reflected back from a radar target [18].

 Keyword(s): ECHO

#### ECHO BOX

A resonant cavity device that is used to check the overall performance of a radar system. It receives a portion of the transmitted pulse and retransmits it back to the receiver as a slowly decaying transient [18].

 Keyword(s): ECHO BOX

#### ECLIPSE

A condition in which the satellite is not in view or in direct line of sight with the sun. This happens when the earth is between them [17].

 Keyword(s): ECLIPSE

#### EDDY CURRENT

Induced circulating currents in a conducting material that are caused by a varying magnetic field [2] [5].

 Keyword(s): EDDY CURRENT

#### EDDY CURRENT LOSS

Losses caused by random current flowing in the core of a transformer. Power
is lost in the form of heat [2].

 Keyword(s): EDDY CURRENT LOSS

#### EDISON EFFECT

Also called RICHARDSON EFFECT. The phenomenon wherein electrons emitted
from a heated element within a vacuum tube will flow to a second element that is connected to a positive potential [6].

 Keyword(s): EDISON EFFECT

#### EFFECTIVE VALUE

Same as ROOT-MEAN-SQUARE [2].
 Keyword(s): EFFECTIVE VALUE

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