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ECE 1250 Video Lecture: L1-2 Units and Scientific Notation
Time Slide Topic
0:00
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Title
0:14
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Capacitor values example (Digi-Key)
0:55
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SI units list
1:40
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Prefixes (k = kilo, etc.)
2:32
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Notation for electrical quantities
3:13
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Engineering units to scientific notation
4:04
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Converting engineering prefixes
5:51
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Conclusion
6:00
9
Scenic Utah: Delicate Arch
ECE 1250 Video Lecture: L1-3 part 1 Circuit Representation
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Title
0:13
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Overview
0:34
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Voltage, DC
1:21
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Gnd, Ref
1:38
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AC Voltage
2:02
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Resistor
2:23
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Variable Resistor/Resistive Sensor (potentiometer, rheostat)
2:57
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Resistance: standard resistor values, variable resistors, 3:22 resistive sensors
3:48
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Voltmeter measurements
3:45
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Measuring Resistance (Ohmmeter)
5:14
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Measuring Current (Ammeter)
6:03
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Circuit Diagram (Measurement of i and v)
6:34
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Series & Parallel (elements)
6:36
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Series (elements): Current is the same
7:43
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Parallel (elements): Voltage is the same
7:44
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combination of R's in series and parallel
9:53
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Wheatstone bridge (application)
ECE 1250 Video Lecture: L1-3 part 2 Circuit Representation
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Series and parallel battery charging
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Two 12V batteries in series
0:45
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Two 12V batteries in parallel
1:20
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12V batteries in series and parallel
1:37
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12V batteries in parallel and series
1:47
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Battery charger, 1 battery
1:56
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Battery charger, 2 batteries
2:08
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Battery chargers, 4 batteries
2:35
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Nodes, (3:10) Paths, (3:32) Loops
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5:00
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Conclusion
Scenic Utah: Delicate Arch
ECE 1250 Video Lecture: L1-4 Charge and Current
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Title
0:09
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Overview
0:19
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Charge (q) Coulombs
0:51
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V=IR
1:09
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V = I R (-I)
1:24
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Charge and Current (i = dq/dt)
1:43
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Charge and Current (Accumulated Charges)
2:10
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Charging a Battery
2:22
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20 Amp-Hour
3:12
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q vs t (for charged battery)
3:44
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Charge, Current (plots)
4:27
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Charge, Current (it really happens this way?)
4:56
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Conclusion
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Scenic Utah: Strawberry River near Heber Utah
ECE 1250 Video Lecture: L1-5 Voltage and Power
Time Slide Topic
0:33
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Voltage phys definition as potential energy
0:59
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Voltage measurement of potential
1:22
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Voltage measurement with probes reversed
1:48
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Voltage measured relative to gnd = 0V
2:07
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Voltage measured at point between R's
3:48
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Voltage measurement with different reference pt
5:26
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Voltage big value examples
6:15
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Voltage small value examples
6:53
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Utah Electrode Array
7:56
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Power, equations from physics
8:19
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passive sign convention
8:48
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battery measurement of V and I, Ohm's law
9:23
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battery power calculation
10:42 14
power conserved in circuit
10:58 15
energy physics equations
12:10 16
energy calculation example (solar powered internet station)
13:26 17
summary
13:41 18
solar powered internet base station Emigration Canyon
ECE 1250 Video Lecture: L2-3 Equivalent Circuits
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Equivalent circuits = same i, v at terminals (x)
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elements in series have same i, in parallel have same v
1:58
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resistors in series add
2:15
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v-divider
2:49
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v-divider card
3:20
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v's in series add
3:56
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i's in series are the same
4:12
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R's in parallel formula
4:33
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R's in parallel conductance formula
5:10
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i-divider
5:35
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i-divider card
6:16
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source transformation, Thev to Norton
7:03
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example 2-10 Ulaby, source transformation
7:55
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summary
8:28
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Scenic Utah: Snow Canyon, St. George
ECE 1250 Video Lecture: Digital
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0:09
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Digital and Binary Numbers
0:38
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Fuel gauge example analog needle, digital gas pump symbol
1:03
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Clock: analog versus digital
1:19
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Tom Stockham and digital recording
2:04
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Measurement equipment: analog versus digital
2:37
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Light bulbs: analog (dimmer switch) versus on/off
2:59
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Voltage waveform: analog versus digital quantized stair step
3:13
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Digitized values: binary numbers for stair steps
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Analog to digital conversion and quantization error
4:04
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Counting with binary numbers
4:33
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Bits and bytes
4:49
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Computer numbers: value x exponent
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Computer letters: ASCII codes
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Write your name in ASCII
5:45
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Pixels digital
6:09
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Color represented by red, green, blue
6:23
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Computer logic: on = 5V = 1, off
6:40
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Battery voltage
6:52
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Is 1.5 V battery charged? Compare V out with 1.3 V.
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Logic gate: AND
8:46
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Logic gate: OR
9:14
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logic gate: NAND
9:42
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Logic gates: NOT and XOR
10:15 24
Building with logic gates: power supplies
10:49 25
Summary
11:14 26
Tombstone rock near Moab
ECE 1250 Video Lecture: 3-1 1 Node Voltage Method
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Outline
0:42
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Elevation and Voltage analogy
2:00
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Branch and Node voltages
3:37
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Branch Currents and Voltages
4:25
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Nodes and Extraordinary (Critical) Nodes
5:45
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Node Voltage Process
ECE 1250 Video Lecture: 3-1 2 Node Voltage Example with Dependent Source
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Example Circuit
0:34
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Critical nodes
0:40
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Reference node
0:44
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Nodes labeled
1:14
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Eqn for top center i
1:43
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Write node equations, v1 node
2:00
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Write labeled current in terms of node v's
2:34
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Equation for v2 node
2:48
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Term for dependent source in terms of node voltages
4:03
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Solving the 2 eqns in 2 unknowns
6:30
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Marking which equations are in use
6:45
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Summing fraction terms
7:40
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Use matrix solver: calculator or Matlab
8:03
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Calculate power generated by dependent source
ECE 1250 Video Lecture: 3-1 3 Node Voltage and Supernodes
Time Slide Topic
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Supernode defined as extraordinary nodes separated by only V source
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Identify extraordinary nodes
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Write node equations
1:12
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V source has no equation to get current from voltage
1:45
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Define extra i variable for v source
2:20
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Write second node equation
2:45
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Add node equations to eliminate extra i variable
3:14
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V equation between nodes
4:01
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Algebra: collect terms (factor out v1 and v2)
4:35
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Substitute for v2 using V equation and solve
6:03
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Supernode: combine two nodes and sum currents out of supernode