Basic Electronics ReviewB. Furman31AUG2010Overview for TodayComments on labsComments on Term ProjectFinish basic electronics reviewBegin signal sourcesLearning ObjectivesExplain in simple terms what is meant by: Voltage Current Ground Resistor, Capacitor, Inductor Impedance PowerDetermine equivalent series and parallel impedancesExplain the significance of a voltage dividerDerive an expression for the impedance of a capacitorMechatronics Concept MapSystem toControlSensorSignalConditioningController(Hardware & Software)PowerInterfaceActuatorUserInterfacePowerSourceBJ Furman 26JAN06ME 106ME 154ME 157ME 195ME 120ME 297AME 106ME 120ME 106ME 190ME 187ME 110ME 136ME 154ME 157ME 182ME 189ME 195ME 106ME 120ME 106Key ConceptsVoltageGroundCurrentResistorCapacitorInductorImpedancePower Take out a sheet of paper Explain the concepts in terms that a 6thgrader could understand First, work on your own, then, introduce yourself to someone you have NOT met yet, and share your answers.Basic Electronics Review - 1 Voltage – put it in terms that a 6thgrader could understand “Pressure” Pressure on electric charge (e-). Units are in Volts Urges charge to ‘flow’ Measured relative to a reference pressure levelAn “across” quantity – we measure it across two points (Don’t say ‘the voltage through…’)R1R2R3Vi+ABCD“High” pressure“Low” pressureVoltage source acts like a pumpGround is often taken as the low pressure point, but any point could be taken as ‘ground’ex. VAD = Vi= -VDABasic Electronics Review - 2 Current – put it in terms that a 6thgrader could understand “Flow” Flow of electric charge (e-). Units are in Amps The response of charge to applied voltage Need a complete circuit for current to flowAn “through” quantity – we measure it through an element or circuitR1R2R3Vi+ABCD“High” pressure“Low” pressureWe will assume ‘conventional’ current flow –positive charges flow out of the + terminal and return to the - terminalIBasic Electronics Review - 3 Resistor – put it in terms that a 6thgrader could understand “Flow restriction” (causes a pressure (voltage) drop across it) Drinking a milkshake through a strawSmall diameter straw – high resistance Causes large pressure dropLarge diameter straw – low resistance Causes small pressure drop Units are in Ohms Dissipates power in heat!R1R2R3Vi+ABCD“High” pressure“Low” pressureBasic Electronics Review - 4Ohm’s Law (know it cold!)V=I*RA relationship between current and voltage for a resistor The slope of the V-I line The voltage drop across a resistor is proportional to the current through itV,voltsI, AmpsRR increasingVI RBasic Electronics Review - 5Resistors in seriesEquivalent resistanceSum of the resistancesResistors in parallelEquivalent resistanceReciprocal is the sumof reciprocals of resistancesR1Vi+ADR3R2Vi+ReqADOriginal Circuit Equivalent CircuitBasic Electronics Review - 6Power (units are in Watts)P = I2R = (V/R)2R = V2/RP = I2R = I2(V/I) = IVNote: can calculate thepower required for anycircuit by measuring I andV and taking their productR1R2R3Vi+ABCDAny
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