Lecture Basic Electronics
-
Upload
korakasusuresh -
Category
Documents
-
view
220 -
download
0
description
Transcript of Lecture Basic Electronics
-
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
***********