GammaPC - Engineering Videosby Prof. Bob Mertens, Ph.D. (AKA Dr. Bob)
Here you can find links to my youtube playlists and links to my youtube channel.
If there is an image with the link, then there is a solved problem with it. If you don't see a problem you're interested in having solved, please send me a copy of the problem and I'll see what I can do about it. These links connect to youtube videos.
Problem 1 Write an equation for charge, given an equation for current.
Problem 2 Analyze the current, voltage and power in a Wheatstone Bridge, using only KVL, KCL and Ohm's Law (it requires at least one known value).
Problem 3 Analyze a simple resistive circuit and a voltage source. Determine the currents, voltages, powers, total power and total current.
Problem 4 How do you determine whether an electronic circuit is balanced and valid? Here are simple ways to find out.
Problem 5 This problem uses KVL, or Kirchoff's Voltage Law, to analyze and resolve potentials (voltages) and currents at various points in an electric circuit with resistors, voltage sources and current sources.
Kirchhoff's Current Law, or, KCL This short seminar explains one of the fundamental concepts regarding electricity, electronics and electronic circuits.
Kirchhoff's Voltage Law, or, KVL This is an example of KVL, applied to a circuit containing a resistors network with voltage and current supplies.
Playlist: Chapter 2
Problem 1 Determine the equivalent resistance of a circuit, and then determine the total power supplied by the source. This is a resistive circuit with a power source, containing several resistors, in series and parallel configurations. This lesson shows how to sort through them and determine the equivalent resistance of the circuit.
Problem 2 Specify the resistors in a circuit in order to meet design criteria, given a current source and a voltage, specified on a node.This is a resistive circuit with a current source, containing several resistors, in parallel configurations. This lesson shows how to determine the correct resistance of each resistor in order to meet the design requirements of the circuit.
Problem 3 Determine the power through a resistor and, gven the current through one of the resistors, determine the supply voltage of a resistor circuit. Use KVL and KCL to calculate the various currents and voltages in the circuit elements, to arrive at a complete analysis of the circuit.
Playlist: Chapter 4
Problem 1 Determine the output voltage of a network of resistors, a voltage source and a current source. In this problem, we use KCL, summing the currents around a node, to determine the output voltage.
Problem 2 Use the node voltage method and supernodes to calculate an output voltage. In this problem, we use the node voltage method, and take advantage of a supernode, to calculate an output voltage in a resistive network with dependent and independent supplies.
Problem 3 Part A Use the mesh current method to calculate the total power developed in the circuit. In this problem, we use the mesh current method, with special constraints, to analyze the circuit and derive a set of formulas in order to solve for the mesh currents.
Problem 3 Part B In Part B, we will use Cramer's Rule to solve three equations and three unknowns. We show the problem in matrix form, then use matrices to show a solution that can be done on paper. Then we use Mathcad (a mathematics program developed by Mathsoft) to solve for our three unknowns, as part of a matrix solution.
Problem 3 Part C In Part C, we will use the mesh currents to solve for the total power in the circuit, and we will examine a spice-based circuit analysis program, LTSpice (developed by Linear Technology, http://www.linear.com/ ) to demonstrate the accuracy of our solution.
Problem 4 Use source transformations to find an output voltage. Sometimes turning a current source into a voltage source, or turning a voltage source into a current source, can make circuit analysis a lot easier.
Problem 5 Part A Thevenin Equivalent Circuit: Use two source transformations and circuit analysis to find the Thevenin equivalent circuit. Sometimes turning a current source into a voltage source, or turning a voltage source into a current source, can make circuit analysis a lot easier. In this case, it is a virtual necessity.
Problem 5 Part B Thevenin Equivalent Circuit:
Problem 5 Part C Thevenin Equivalent Circuit:
Problem 5 Part D Thevenin Equivalent Circuit:
Problem 6 Part 1 of 3 Use the Principle of Superposition to perform circuit analysis. Sometimes it is easier, in a complicated circuit, to use superposition in order to determine the voltages at various nodes.
Problem 6 Part 2 of 3Problem 6 Part 3 of 3Problem 7 Find the Norton Equivalent Circuit, using source transformations.
Home: A place where you can sit back, relax and pretend that the rest of the world doesn't exist.
Videos: Here you can find videos of some of my adventures in sailing, racoons, gate-building and more.
Nanotechnology: We are beginning explorers in this fantastic new world of the extremely small - the nanoscale.
Gammascopes: We are looking at the use of an amazing material, aluminized Mylar, to make telescope mirrors.
Gammabooks: GammaPC was originally Gamma Publishing Company, which sold books. I still sell books. I'm also putting some of my books online, here, and you can read them free (with advertisements) or download them (commercial-free) to your reading device. Thank you for your readership. Soon, I hope to make them available in paperback/hardcover. Some copies of the TE Theory in hardcover are still available. These are extremely rare books (a single printing), which at one time, sold for upwards of $3,000. I used very high-quality acid-free paper to print them, so they're in mint condition (and new - never opened).
Spray Cooling: This is a subject of considerable research and we presently hold the world record for the highest heat flux through any electron device, an IGBT, at 825 W/cm2.
Services: We provide research, specifically in technical areas.
About Us: Find out who we are - pictures included.