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# Ohms law presentation june -updated glm

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• Speaker: Glenn MossyBiography: Glenn has forty years of taking things apart and building new things, with a special interest in all things robotics. In his home hackerspace, Glenn currently is building a number of Arduino based shields for robotics and enjoys introducing others to the fun of electronics. Thirty years ago he gave his first presentation on motor-control for robotics at a conference with the International Association of Science and Technology for Development (IASTED). Glenn holds a bachelors degree in Electrical Engineering from Louisiana Tech University (1986). Visit him and read his blog athttp://gmossy.wordpress.com
• Hi My name is Glenn Mossy and I’m a maker, electronics hobbyist hacker. My grandpa gave me a Radioshack electronics 100 in 1 kit when I was 8.I buildnumber of Arduino based shields for robotics and enjoys introducing others to the fun of electronicsI am going to make 3 points in my talk.Point 1. Setting up your labPoint 2. Ohm’s LawPoint 3 Using Ohms law for Practical Use.
• The fundamental units.What are the common voltage supplies for your experiments?How much current do these projects we are going to build need?All about Resistors.
• This is a law that helps in the understanding of how voltage and opposition in a circuit affect current.It does not help in the determination of how a voltage is produced.It does not help in the determination of the factors affecting resistance.V = IR (current &amp; resistance do not affect voltage)R = V/I (voltage &amp; current do not affect resistance)
• A battery is like the Water pump.Water Pump creates the potential and has a input and output.You want the water to flow once the hose circuit is completed.This creates your voltage.Water Flowing = Current Flow as in Current.
• Using the original law in some AC circuits does not return the value of current, and the modified version does.impedance.” a measure of the opposition to time-varying electric current in an electric circuitWhen this law was ascertained by George Simon Ohm, the only circuit property known at the time was Resistance.I = E / R . . . . . Good only in resistive circuits!!Michael Faraday, John Henry and others later discovered Inductance and CapacitanceInductance and/or capacitance in an alternating current circuit also exhibit ‘Opposition” to circuit current. Z = (R2 +(XL - XC)2)To be able to use the Ohm’s Law concept in all circuits one must use I = E / Z . . . Good in all Circuits!
• Q. What is the current through the resistor? I = V/RQ. What is the voltage across the resistor? V = I RQ. What is the resistance of the resistor? R = V/I
• Summarize 3 points in my talk.Point 1. Setting up your labPoint 2. Ohm’s LawPoint 3 Using Ohms law for Practical Use.
• Leyen JarFrog LegBatteryHeat ConstantThe Galvanic Circuit Investigated Mathematically) (1827)
• Explain Each
• ### Ohms law presentation june -updated glm

1. 1. ElectronicsTechnologyThe Importance of current, resistance, voltage & ohms law.HelpingYour Raspberry PI SurviveYouGlenn Mossygmossy@yahoo.com~June 2013Some Kind of User Group(SKUG)
2. 2. Points I’m going to cover Ohms Law•Fundamental Units•Ohm’s Law•LED Resistor ExampleOhm’s Law Practical Use Example• Going Further with Ohms Law
3. 3. Current shown Graphically!!6.24 x 1018 electronsConductorGiven Point1 CoulombRate of Electron flow(CURRENT) is1 Coulomb per second(1 AMPERE)1 C = 1 A x 1 second1 Coulomb moved . .
4. 4. Ohm’s Law States that• The current is directly proportional to the voltage and indirectlyproportional to the resistance.
5. 5. Hydraulic Analogy• Electricity might be compared to water:• A battery could be likened onto a water pump.• Voltage (V) or water pressure (pounds per square inch).• Current could be likened onto the flow rate of water.• Coulombs per second = Amperes (A) or gallons per minute.• A wire is analogous to a water hose.• Squeezing the hose is Resistance (R) on the water hose.• An open switch is like a closed valve . .
6. 6. • Ohm’s original Law was determined when capacitance and inductance wasstill not studied in detail.• So that Ohm’s Law can be used in any circuit including Alternating currentcircuits:• Modification:• The current is directly proportional to the voltage and indirectlyproportional to the impedance.”Ohm’s Law then & now!
7. 7. Questions
8. 8. References• Wikipedia: http://en.wikipedia.org/wiki/Ohms_law• Circuitlab Website: https://www.circuitlab.com• Care and Feeding of LED’s: http://www.thebox.myzen.co.uk/Tutorial/LEDs.html• Spice Info: http://bwrcs.eecs.berkeley.edu/Classes/IcBook/SPICE/• Physics Classroom: http://www.physicsclassroom.com/Class/circuits/u9l3c.cfm• Experiments: http://www.juliantrubin.com/bigten/ohmlawexperiments.html• Ohm Unit: http://en.wikipedia.org/wiki/Ohm_(unit)
9. 9. Georg Simon Ohm“Die galvanische Kette”Faraday1836Maxwell2nd Great Unification in Physics1879Kirchoff1845Henry1831Helmholtz1842Ohm’s Law’s ImportanceKleist & Muschenbrook1746Galvani1780Volta1800Fourier18221827
10. 10. Getting starting with your experiments