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### 41 Cards in this Set

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 Technology The use of tools materails and knowledge to slove problems Electricity Moving electrons Practical Circuit a collection of devices that let use use electricity saftly and effieciently Parts of a circuit load,source,complete conductor path,control, and protection Circuit problems Open circuit-conductor path is not complete Short circuit-electricity can flow through the circuit without going though the load Volt measure of electrical pressure Amp measure of the rate of flow of electricity Ohm measure of electrical resistence Series circuit only one path for the current to flow through Parallel circuit more than one path for the current to flow through Combonation Circuit combines both series and parallel circuits into one circuit Insulator a material that i different (but not impossible) for electricity to flow though Conductor a material that is easy for electricity to flow through Type NM Nonmetallic outer covering 14 wire gage 2 2 conductors (one black and one white) W/G with gage wire Duplex outlet (color coding rules) White wire directly to one side of the applience Black wire directly to second side of the applience One lamp controlled by one SPST switch White wire directly to one side of the applience Black wire to one side of switch Black wire from second side of switch to applience Schematic Drawing uses symbols to represent electrical components SPST single pole double throw SPDT single pole double throw DPDT double pole double throw DPST double pole single throw The fatal current .01 amp Ground fault is a small elcetrical current that "leaks" from the hot wire to ground. A ground fault can produce a severe electric shock in damp locations. Ground fault circuit interrupter (GCFI) a protective device that detects even small ground faults and disconnects the circuit Solder an alloy of tin and lead Alloy a combination of two or more metals that has properties different from any of the original metals Flux a chemical that cleans metal so that the solder will stick to it Splice a mechanical connection between two or more wires Relay a magnetically operated switch N.O. contact normally open- contact is open when relay is off N.C. contact normally open- contact is closed when relay is off to find current current = Volts divided by ohms (I= divided by R) to find volts volts= volts = amps X ohms to find ohms ohms = volts divided by amps ( R= E divided by I) To solve ohm's law equations 1. write down the equation 2. put the values you know 3. do the math 4. label your answer Energy (quantity) the ability to do work or bring about a change (measured in kilowatt hours) Power (rate) the rate at which work is being done (measured in watts or horsepower) Ohms' Law the mathmatical relationship between volts, amps, ans ohms in a circuit