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Introduction to Electrical & Computer Engineering
Circuit Representation
Dr. Cynthia Furse
University of Utah
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Introduction to Electrical Engineering
Circuit Representation
•
•
•
•
•
•
Voltage, Current, Resistance
Ground / Reference / Neutral
Variable Resistors / Resistive Sensors
Measuring V,I,R
Series & Parallel elements
Node, Path, Loop
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Voltage (DC)
I DC
+
-
VDC
VDC
I DC
+ I DC
-V
VDC
-
Ground / Reference / Neutral
Vref(erence)
Vref(erence)
= 0V
= ground
= 0V
= ground
Voltage (AC)
VAC
+
̴V
+
-
VAC
Resistor
R (Ω)
R (Ω)
Variable Resistor / Resistive Sensor
R (Ω)
Resistance
• Standard Resistor Values
• Variable resistor
a)Potentiometer: 3-terminal variable resistor.
Rheostat: 2-terminal variable resistor
• Resistive Sensor
– Temperature – Thermister
– Pressure – Piezoresistor
– Light intensity – Light-dependent R (LDR)
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Measuring Voltage (Voltmeter)
DVM = Digital VoltMeter
+
DC
voltmeter
+
VΩ com A
VDC
DVM
-
-
AC (RMS)
voltmeter
+
̴V
AC
RMS
-
Measuring Resistance (Ohmeter)
Ohm
meter
VΩ com A
Ω
Measuring Current (Ammeter)
+
DC
ammeter
+
VΩ com A
-
I DC
-
AC RMS
ammeter
+
̴
I AC
RMS
Circuit
Diagram
Picture From: Wikipedia
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Series & Parallel
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Series: CURRENT is the same
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Parallel: VOLTAGE is the same
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Wheatstone Bridge
• Tune Rv until V= 0
• Ru = (R2/R1) Rv
V
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Series / Parallel Battery Charging
• http://batterytender.com/resources/connecti
ng-batteries-chargers.htm
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Nodes, Paths, Loops
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Conclusion:
Circuit Representation
•
•
•
•
•
Voltage, Current, Resistance
Variable Resistors / Resistive Sensors
Measuring V,I,R
Series & Parallel elements
Node, Path, loop
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Introduction to Electrical & Computer Engineering
Circuit Representation
Dr. Cynthia Furse
University of Utah
Peekaboo Slot Canyon
Near Kanab, Utah
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