Electronics (Mike Jaroch)


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P

POSITIONAL WEIGHTING

The value given a digit based on the digit's position within a given number
[13].

POSITIVE ALTERNATION

The part of a sine wave that is above the reference line [2] [10] [12].

POSITIVE CLAMPER

A circuit that clamps the lower extremity of the output waveshape to a dc
potential of 0 volts [9].

POSITIVE FEEDBACK

Feedback in which the feedback signal is in phase with the input signal. Also
called REGENERATIVE FEEDBACK [8].

POSITIVE LOGIC

The form of logic in which the more positive logic level represents 1 and the more negative level represents 0 [13].

POSITIVE TEMPERATURE COEFFICIENT

The characteristic of a conductor in which the resistance increases as temperature increases [7].

POTENTIAL ENERGY

Energy caused by the position of one body with respect to another body or to
the relative parts of the same body [1].

POTENTIOMETER

A variable resistor, used as a position sensor in servosystems, having a terminal
connected to each end of a resistive element and a third terminal connected to a wiper contact. The output is a voltage that is variable depending upon the position of the wiper contact. The potentiometer is commonly referred to as a variable voltage divider. It, in effect, converts mechanical information into
an electrical signal [1] [15].

POWER

The rate of doing work or the rate of expending energy. The unit of electrical power is the watt [1].

POWER AMPLIFIER

An amplifier in which the output-signal power is greater than the input-signal
power [8].


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