Dope the semiconductor to create a diode. Watch the electrons change position and energy.
Dope the semiconductor to create a diode. Watch the electrons change position and energy.
Why does the deflection change when an electromagnet is attached to the circuit? Does it matter what side of the electromagnet we test? Created by Brit Cruise.
Resistors connected head-to-tail are in series. The equivalent overall resistance is the sum of the individual resistance values. Created by Willy McAllister.
Resistors connected head-to-tail are in series. The equivalent overall resistance is the sum of the individual resistance values. Created by Willy McAllister.
At the University of St. Thomas in Minnesota, this engineering professor and her team demonstrate that science or engineering lessons can be found in almost anything -- and a sense of play can make those lessons accessible and incite young minds.
Syllabus of open/free readings.
Course description:
This course addresses the general lab skills and knowledge required to function safely and effectively in an electronics laboratory or shop environment. The student will be introduced to concepts in electronic circuit assembly, wire termination, and soldering. Included is an overview of various electrical schematics and diagrams used in the design, assembly, and repair of electrical and electronic systems. The proper use of common lab equipment and hand tools will be covered. This is a hands-on course intended to give the student experience performing tasks that are best taught by practice.
In this activity about electricity, learners explore what happens when you blow a fuse. Learners short-circuit a battery using copper wire (a good conductor with very low resistance) and thin iron wire. Learners will discover that when they connect the clip to the iron wire, the voltage of the battery pushes electrons through the circuit against the resistance of the iron wire, causing the iron wire to heat up. Note: the wire gets very hot! Use this activity to introduce learners to basics of electricity including conductivity, resistance, and currents as well as electronics safety and circuit breakers.
Why do the lights turn on in a room as soon as you flip a switch? Flip the switch and electrons slowly creep along a wire. The light turns on when the signal reaches it.
Why do the lights turn on in a room as soon as you flip a switch? Flip the switch and electrons slowly creep along a wire. The light turns on when the signal reaches it.
The sign convention for passive components defines what we mean by positive and negative voltage and current. Created by Willy McAllister.
In this activity, learners create a tiny electric, motorized dancer. Learners use the interactions of magnetism and electric current to make a wire spin, while displaying the Lorentz Force in action. This lesson guide provides one of many ways to build the spinner and links to other methods.
A systematic approach to simplify a complicated resistor network by looking for series and parallel resistor patterns. Created by Willy McAllister.
Sine and cosine can be generated by projecting the tip of a vector onto the y-axis and x-axis as the vector rotates about the origin. Created by Willy McAllister.
If we introduce time as the argument to the sine function, we get a sine wave. Animated. Created by Willy McAllister.
This course focuses on a systematic approach to the design of analog electronic circuits. The methodology presented in the course is based on the concepts of hierarchy, orthogonality and efficient modeling. It is applied to the design of negative-feedback amplifiers. It is shown that aspects such as ideal transfer; noise performance, distortion and bandwidth can be optimized independently. A systematic approach to biasing completes the discussion. Lectures are interactive and combined with weekly sessions where students can work on exercises under supervision of the professors.
This course provides an introduction to linear systems, transfer functions, and Laplace transforms. It covers stability and feedback, and provides basic design tools for specifications of transient response. It also briefly covers frequency-domain techniques.
A quick review of some ideas from trigonometry that will help us with AC analysis. The definitions of sine, cosine, and tangent, circles, degrees, radians. Created by Willy McAllister.
We use the inside of a pencil (graphite) to apply different "lengths of pencil" to the circuit. What relationship do you observe between length of graphite and deflection angle? Created by Brit Cruise.
The output voltage is a fixed fraction of the input voltage. The ratio is determined by two resistors. Created by Willy McAllister.