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Transcript
Lab 1 Breadboard and Measurement Techniques Tom Rebold Calculate the current in this circuit using Ohm’s Law 3W I 6V V I R Ohm’s Law, Including Power Reproduced by permission of Tony van Roon, 2002 http://www.uoguelph.ca/~antoon How Many Watts dissipated by Resistor? 300 W 2A P=I2R Series Circuits One current path, therefore the current is the same everywhere Total resistance is the sum of the individual resistances RT R1 R2 ... VOLTAGE DIVIDER I V1 I R1 R2 V2 IR2 R2 V2 V1 R1 R2 Calculate RT and the current in this circuit, and v1 4W 6V 8W v1 Parallel Circuits More than one current path Total current is the sum of the individual currents IT I 1 I 2 ... Parallel Circuits (2) RT 1 1 1 1 ... R1 R 2 R 3 R1 R 2 (if 2 only ) R1 R 2 R (if the same value n Calculate RT and the current in each branch of this circuit IT i1 6V i2 6W 3W Calculate RT and the current in each branch of this circuit IT 3W i1 6V i2 6W 6W Lab--The Breadboard Vin (6 V) Vss (Ground) Each row is Connected Lab--A Simple Circuit Vin (6 V) Vss (Ground) Each row is Connected Wire the following parallel circuit on the breadboard IT i1 6V i2 6W 3W The Parallel circuit from previous Vin (6 V) Vss (Ground) A Series Circuit Vin (6 V) Vss (Ground) Lab--Measure Volts in Parallel Because the voltmeter is placed in parallel with the circuit element, you do not need to physically alter your circuit in order to measure voltage. Measure Voltage in Parallel Vin (6 V) Vss (Ground) V Measure Current in Series You must physically modify your circuit: 1.Create a gap in the segment where you want to measure current. 2. Reconnect the gap using your ammeter as a jumper wire Measure Current in Series Vin (6 V) Vss (Ground) A Caution!!! If you measure Amps in parallel, you can damage the meter Measure Resistance out of circuit Select the ohms mode, remove the resistor to be measured from your circuit, and place the ohmmeter leads across the resistor leads. It is not OK to use your fingers to do this (your body resistance will change result!) Web References Learn Electronics Tutorials and Information Pages http://www.twysted-pair.com/ Electronics Tutorials Tutorials for Learning about Electronics http://www.electronics-tutorials.com/ http://www.iguanalabs.com/maintut.htm AC Electricity and Electronics http://www.sweethaven.com/acee/default.htm Web References Jones on Stepper Motors Holt Software http://www.cs.uiowa.edu/~jones/step/ http://www.holtsoft.com/ Turing, Computer Engineering textbooks Tony’s Website http://www.uoguelph.ca/~antoon/ Many excellent tutorials, example circuits