## Electronics (Mike Jaroch)

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### E

#### ERROR SIGNAL

(1) In servosystems, the signal whose amplitude and polarity or phase are used to correct the alignment between the controlling and the controlled elements. (2) The name given to the electrical output of a control transformer [15].

 Keyword(s): ERROR SIGNAL

#### EUTECTIC ALLOY

An alloy that changes directly from a solid to a liquid with no plastic or semiliquid state [14].

 Keyword(s): EUTECTIC ALLOY

#### EUTECTIC SOLDER

An alloy of 63 percent tin and 37 percent lead. Melts at 361o F [14].
 Keyword(s): EUTECTIC SOLDER

#### EXCITATION VOLTAGE

The supply voltage required to activate a circuit [15].
 Keyword(s): EXCITATION VOLTAGE

#### EXCITING CURRENT

The current that flows in the primary winding of a transformer when the
secondary is open-circuited; it produces a magnetic flux field. Also called magnetizing current [2].

 Keyword(s): EXCITING CURRENT

#### EXCLUSIVE OR

A function whose output is a 1 if one and only one of the input variables is a 1 [13].
 Keyword(s): EXCLUSIVE OR

#### EXCLUSIVE-OR GATE

A gate that produces a logic 1 output when the inputs are different, but not
when they are the same [13].

 Keyword(s): EXCLUSIVE-OR GATE

#### EXPONENT

The numeral written in superscript (102) which indicates the power to which the base is to be raised [13].

 Keyword(s): EXPONENT

#### EXPRESSION

A validated series of variables, constants, and functions that can be connected by operating symbols to describe a desired computation [13].

 Keyword(s): EXPRESSION

#### EXTERNALLY EXCITED METER

A term used to describe meters that get their power from the circuit to which they are connected [16].

 Keyword(s): EXTERNALLY EXCITED METER

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