Transcript Introductory Electronics

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