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- Differential equation theorem
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- Diode equation
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- Inductor - how it works
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- Inductor kickback
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- Line of charge - test charge off the end
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- Linearity of electronic components
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- People are saying
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- Preparing to study electrcial engineering
- Rarely asked questions
- RC natural response - derivation
- RC natural response - intuition
- RC step response - derivation
- RC step response - intuition
- RC step response
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- Resistivity
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- RMS
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- Define the standard electrical units
- Staticman at Heroku
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Videos
- Complex exponentials spin
- Complex numbers
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- ELI the ICE man
- Euler's cosine wave
- Euler's formula
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- Impedance of simple networks
- Impedance vs frequency
- Impedance
- AC analysis - introduction part 1
- AC analysis - introduction part 2
- KVL in the frequency domain
- Lead Lag
- Magnitude of a complex exponential
- Multiply by j is rotation
- Negative frequency
- Sine and cosine come from circles
- Sine and cosine from a rotating vector
- Sine of time
- AC superposition
- Trigonometry review
- A capacitor integrates current
- Capacitor i-v equations
- Circuit terminology
- Circuit with two batteries solved by Node Voltage Method (1)
- Circuit with two batteries solved by Node Voltage Method (2)
- Resistor circuit with two batteries
- Conventional current direction
- Current direction
- Current
- Diode graphical solution
- Diode
- Discovery of magnetism
- Discovery of Electromagnetism
- Application of the fundamental laws - setup
- Application of the fundamental laws - solve
- Ideal circuit elements
- Ideal Sources
- Inductor equations
- Inductor kickback (1 of 2)
- Inductor kickback (2 of 2)
- Kirchhoff's Current Law
- Kirchhoff's Voltage Law
- Labeling voltages
- LC natural response - derivation 1
- LC natural response - derivation 2
- LC natural response - derivation 3
- LC natural response - derivation 4
- LC natural response - example
- LC natural response - intuition 1
- LC natural response - intuition 2
- Mesh current method steps 1-3
- Mesh current method steps 4-5
- Node voltage method steps 5
- Node voltage method steps 1 to 4
- Feedback
- What is an operational amplifier?
- Inverting op-amp
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- Summing op-amp
- Virtual ground — examples
- Virtual ground
- Parallel resistors (1)
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- Sign convention for passive components
- RC natural response - derivation
- RC natural response - example
- RC natural response - intuition
- RC step response - example
- RC step response - intuition
- RC step response - setup
- RC step response - solve
- Series resistors
- Simplify resistor networks
- Sketching RC exponentials - examples
- Sketching RC exponentials
- Spinning Numbers Fourier series
- Triboelectric effect
- Voltage divider
- Voltage
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Questions
How the circuit simulators are capable of doing the simulations like a natural device. How node voltages are calculated in simulators?
Simulators turn a “natural device” into a collection of basic elements (resistors, capacitors, diodes, and dependent voltage or current sources). See for example the Ebers-Moll model (https://en.wikipedia.org/wiki/Bipolar_junction_transistor#Ebers%E2%80%93Moll_model).
The simulator builds a matrix with these device models plus the resistors and capacitors you add yourself. The matrix is solved to get the node voltages and element currents. The method is a lot like the Node Voltage Method https://spinningnumbers.org/a/node-voltage.html.
Hello Willy, thanks for this great site! Although I’m not a native English your words are so easy to understand! If you ever write a book let me know I would immediately buy a copy!
Johannes, Thanks for visiting. I hope you discover some interesting things here. I’m happy to answer questions. And thanks for noticing the writing style. Every time I revise my own articles I look for ways to say things simply. No need to say “derivation” when “figure it out” will do. Good luck.