Successive powers of the imaginary unit j correspond to a rotation. Created by Willy McAllister.
The concept of negative frequency is perplexing, but it makes sense when you think about rotating complex exponentials.
Students learn the functions of pre-programmed microcontroller units such as the LilyMini ProtoSnap as they use them to create light-up pennants with LED components. Students design their own felt pennants and sew on circuit components using conductive thread. This activity gives students hands-on experience with engineering technologies while making creative pennants with LED lights that can illuminate in three pre-programmed sequences: all on, breathing, and twinkle.
Last step of the Node voltage method for analyzing circuits: Solve the system of simultaneous equations. Created by Willy McAllister.
The Node Voltage Method solves circuits with the minimum number of KCL equations. Steps 1 to 4 out of 5. Created by Willy McAllister.
See how the equation form of Ohm's law relates to a simple circuit. Adjust the voltage and resistance, and see the current change according to Ohm's law. The sizes of the symbols in the equation change to match the circuit diagram.
See how the equation form of Ohm's law relates to a simple circuit. Adjust the voltage and resistance, and see the current change according to Ohm's law. The sizes of the symbols in the equation change to match the circuit diagram.
The goal of this text, as its name implies, is to allow the reader to become proficient in the analysis and design of circuits utilizing modern linear ICs. It progresses from the fundamental circuit building blocks through to analog/digital conversion systems. The text is intended for use in a second year Operational Amplifiers course at the Associate level, or for a junior level course at the Baccalaureate level. In order to make effective use of this text, students should have already taken a course in basic discrete transistor circuits, and have a solid background in algebra and trigonometry, along with exposure to phasors. Calculus is used in certain sections of the text, but for the most part, its use is kept to a minimum. For students without a calculus background, these sections may be skipped without a loss of continuity. (The sole exception to this being Chapter Ten, Integrators and Differentiators, which hinges upon knowledge of calculus.)
Resistors are in parallel if their terminals are connected to the same two nodes. The equivalent single parallel resistance is smaller than the smallest parallel resistor. Created by Willy McAllister.
Multiple resistors in parallel can be combined into a single equivalent resistor. Created by Willy McAllister.
When two resistors are in parallel, the equivalent resistance is the product of the two resistors divided by their sum. When both resistors are the same value, the equivalent parallel resistance is exactly half of the original resistance. Created by Willy McAllister.
A pencil causes a change in the deflection, similar to the effect of adding an electromagnet. Why? Created by Brit Cruise.
See how light knocks electrons off a metal target, and recreate the experiment that spawned the field of quantum mechanics.
See how light knocks electrons off a metal target, and recreate the experiment that spawned the field of quantum mechanics.
This course is an introduction to electromagnetism and electrostatics. Topics include: electric charge, Coulomb’s law, electric structure of matter, conductors and dielectrics, concepts of electrostatic field and potential, electrostatic energy, electric currents, magnetic fields, Ampere’s law, magnetic materials, time-varying fields, Faraday’s law of induction, basic electric circuits, electromagnetic waves, and Maxwell’s equations. The course has an experimental focus, and includes several experiments that are intended to illustrate the concepts being studied.
Acknowledgements
Prof. Roland wishes to acknowledge that the structure and content of this course owe much to the contributions of Prof. Ambrogio Fasoli.
Testing energy consumption in a lightbulb.
Testing if a bulb is nonohmic.
Let's look at the properties of materials that cause a resistor to resist the flow of current. Created by David SantoPietro.
Resistors that come one after another. Created by Sal Khan.
What are the circuits, mechanisms and representations that permit the recognition of a visual scene from just one glance? In this one-day seminar on Scene Understanding, speakers from a variety of disciplines - neurophysiology, cognitive neuroscience, visual cognition, computational neuroscience and computer vision - will address a range of topics related to scene recognition, including natural image categorization, contextual effects on object recognition, and the role of attention in scene understanding and visual art. The goal is to encourage exchanges between researchers of all fields of brain sciences in the burgeoning field of scene understanding.