Basic Electronics ReviewB. Furman28JAN2014

Learning ObjectivesItems to focus on this weekLab 1PortMaster buildHW 1 and Questionnaire due ThursdayTerm Project overviewExplain in simple terms what is meant by:VoltageCurrentGroundResistor, Capacitor, InductorImpedancePowerDetermine equivalent series and parallel impedancesExplain the significance of a voltage dividerDerive an expression for the impedance of a capacitor

Mechatronics Concept Map INTEGRATION

Lab 1 Intro to the Mechatronics LabRead and prepareTake the pre-lab quiz

PortMasterSolder practiceBit manipulation and port IO learning

HW 1 and QuestionnaireWhen are they due?Hard and softcopy

Term Project OverviewVideo sample of previous projects

Key ConceptsVoltageGroundCurrentResistorCapacitorInductorImpedancePowerTake out a sheet of paperExplain the concepts in terms that a 6th grader could understandFirst, work on your own, then, introduce yourself to someone you have NOT met yet, and share your answers.

Basic Electronics Review - 1Voltage put it in terms that a 6th grader could understandPressurePressure on electric charge (e-). Units are in VoltsUrges charge to flowMeasured relative to a reference pressure levelAn across quantity we measure it across two points (Dont say the voltage through)Voltage source acts like a pumpGround is often taken as the low pressure point, but any point could be taken as groundex. VAD = Vi = -VDA

Basic Electronics Review - 2Current put it in terms that a 6th grader could understandFlowFlow of electric charge (e-). Units are in AmpsThe response of charge to applied voltageNeed a complete circuit for current to flowA through quantity we measure it through an elementWe will assume conventional current flow positive charges flow out of the + terminal and return to the - terminalI

Basic Electronics Review - 3Resistor put it in terms that a 6th grader could understandFlow restriction (causes a pressure (voltage) drop across it), an impedanceDrinking a milkshake through a strawSmall diameter straw high resistanceCauses large pressure dropLarge diameter straw low resistanceCauses small pressure dropUnits are in OhmsDissipates power in heat!

Basic Electronics Review - 4Ohms Law (know it cold!)V=I*RA relationship between current and voltage for a resistorThe slope of the V-I lineThe voltage drop across a resistor is proportional to the current through it

Basic Electronics Review - 5R1Vi+ADR3R2Vi+ReqADOriginal CircuitEquivalent Circuit

Basic Electronics Review - 6Power (units are in Watts)P = I2R = (V/R)2R = V2/RP = I2R = I2(V/I) = IVNote: can calculate the power required for any circuit by measuring I and V and taking their product

CapacitorCapacitor put it in terms that a 6th grader could understandAccumulator, water tankPressure storage. Stores energy in an electric fieldVoltage across the leads takes time to build up. Units of capacitance are Farads+-V

InductorInductor put it in terms that a 6th grader could understandFlywheel, merry-go-roundAn inertia. Stores energy in a magnetic fieldTries to oppose changes in current flow. Units of inductance are Henrys+-iV

The Voltage DividerConsider two resistances in seriesWhat is VA in terms ofVi, R1 and R2

So what? Why is this important?Voltage divider effect occurs whenever one circuit is connected to anotherVoltage dividers can be used to set a voltage level somewhere between a given supply voltage and groundIf significant current is desired, it is better to use a power supply or voltage regulator

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