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phillips: A term used to refer to both a screw with a plus (+) shaped slot in the head and the screwdriver used with it.
photoresist: (also called sensitizer or resist) A light-sensitive chemical layer used in making circuit boards.
piezoelectric effect: The ability of certain crystals quartz and topaz are examples to expand or contract when you apply voltage to them.
pn junction: When regions containing boron and phosphorus are next to each other in a semiconductor, a pn junction is created.
positive temperature coefficient (PTC) thermistor: A device whose resistance increases with a rise in temperature. See also resistance, thermistor.
potentiometer: A variable resistor that allows for continual adjustment of resistance from virtually no ohms to some maximum value.
power: The measure of the amount of work that electric current does while running through an electrical component measured in Watts.
precision resistors: A type of resistor with low tolerance.
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prescaler: A device that extends the useful operating frequency of a frequency counter.
proton: A positively charged particle. See also electron. prototyping board: See breadboard.
p-type semiconductor: A semiconductor with contaminates added that cause it to have fewer electrons than a pure semiconductor.
pulse: A signal that alternates between high and low very rapidly.
pulse width modulation: A method of controlling the speed of a motor that turns voltage on and off in quick pulses. The longer the on intervals, the faster the motor goes.
R: The symbol for resistance.
RC time constant: A formula used to calculate the time it takes to fill a capacitor to two-thirds or discharge it to one-third of its capacity.
real current: The flow of electrons from a negative to a positive voltage.
relay: A device that acts like a switch in that it closes or opens a circuit depending on the voltage supplied to it.
resist: See photoresist.
resistance: The measurement of the ability of electrons to move through a material.
resistor: A component you add to a circuit to reduce the amount of electrons flowing through the circuit.
rosin flux remover: Available in a bottle or spray can, use this after soldering to clean any remaining flux to prevent it from oxidizing your circuit.
SPDT: See single-pole, double-throw switch.
schematic: A drawing showing how components in a circuit are connected together by wires.
semiconductor: A material, such as silicon, that has some of the properties of both conductors and insulators.
semiconductor temperature sensors: A kind of temperature sensor that varies the output voltage depending on temperature.
sensitizer: See photoresist. term LinG - live, informative, Non-cost and Genuine !
396 Electronics For Dummies
sensors: Electronic components that sense a condition or effect such as heat or light.
series circuit: A circuit in which the current runs through each component sequentially.
short circuit: Where two wires are accidentally connected together and current goes through them rather than completing the circuit as intended.
sine wave: An output signal.
single-pole switch: A type of switch that has one input wire.
single-pole, double-throw switch (SPDT): A type of switch that has one wire coming into the switch and two wires leaving the switch.
60/40 rosin core: The ideal solder for working with electronics containing 60 percent tin and 40 percent lead (the exact ratio can vary a few percentage points) with a core of rosin flux.
slide switch: A type of switch you slide forward or backward to turn something (such as a flashlight) on or off.
solar cell: A type of semiconductor that generates a current when exposed to light.
soldered breadboard. A breadboard on which you have soldered components in place. See also breadboard.
soldering. The method you use in your electronics projects to assemble components on a circuit board to build a permanent electrical circuit; instead of using glue to hold things together, you use small globs of molten metal called solder.
soldering iron. See soldering pencil.
soldering pencil: A wand-like tool that consists of an insulating handle, a heating element, and a polished metal tip used to apply solder.
solderless breadboard: See breadboard.
solder sucker: A tool used for removing excess solder. The sucker is a spring-loaded vacuum.
solder wick: (also called solder braid) A device used to remove hard-to-reach solder. The solder wick is really a flat braid of copper. It works because the copper absorbs solder more easily than the tin plating of most components and printed circuit boards.
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solid wire: A wire consisting of only a single strand. spike: See voltage spike. square wave. An output signal.
static electricity: A form of current that remains trapped in an insulating body.
strain relief: A device that clamps around a wire and prevents you from tugging the wire out of the enclosure.