Nervous system messages are sent as electrical signals along the length of axons and dissolved salts are important for electrical signaling in cells. In this lesson students are introduced to this concept by creating an electrical...

How far would you have to travel so that the light of the full sun would provide "daylight" no brighter than twilight on Earth? This project describes a method to verify the inverse square law: how light, sound, electrical signals, and...

[Free Registration/Login may be required to access all resource tools.] Covers electronic signal, how an electric current can be used to send an electronic message, what analog and digital signals are, and the difference between them.

Learn how electricity flows through a circuit by watching how the electrons move.

Online, college-level course on electronics. Class features the practical introduction to electronics with a focus on measurement and signals. Accessible components include downloadable lecture notes, assignments, and previous quiz and...

Amplifiers make signals bigger. Amplification is often the most basic operation of an electronic circuit. There are many kinds of amplifier designs. We will describe the operational amplifier, the building block of most analog electronics.

Why do the lights turn on in a room as soon as you flip a switch? Flip the switch and watch the electrons. Does the light turn on immediately? Explain using observations of the model.

In this lesson plan the students will learn how the heart functions. Students will be introduced to the concept of action potential generation. The lesson plan will explain how action potential generation causes the electrical current...

Students will learn the components of the membrane that establish the resting membrane potential, and find out the changes that occur to the membrane that result in the action potential.

This illustrated essay from A Science Odyssey Web site explains the science behind radio waves, including the role of electrons and electromagnetic fields.

Self-guided learning activity where students learn about the structure and function of the human nervous system. There is a short quiz at the end of the lesson to check for understanding.

"This model shows a design of an electronic star coupler that can split an input electric signal into three outputs."

Hammerhead sharks are recognizable for their bizarre head shape which is thought to make the shark more sensitive to electrical signals used to detect hidden prey. There are ten species of hammerhead. Learn more about hammerhead sharks...

Have you heard of a disease called Parkinson's? When people have this disease they often show signs or symptoms, like shaking uncontrollably. This shaking can make doing simple things harder. Emma Lawton is a person with Parkinson's, and...

See how electrical and chemical signals are used by neurons to communicate with one another at synapse contact points. [1:09]

The voltage in AC circuits oscillates at a rate known as the frequency. With an oscilloscope, see and measure the length of time between signals, and calculate the frequency of an AC signal.

No other mammal in the world looks like the star-nosed mole, which has 22 fingerlike appendages surrounding its nostrils. It has recently been discovered that these very sensitive tactile organs are used for object manipulation, and...

A collection of video lectures from a course introducing students to the theory and practices in digital communications. Webpage includes twenty-four lectures from a professor at the Massachusetts Institute of Technology. Lectures vary...

This site contains a straightforward definition of resonance in an electrical circuit.

American inventor Lee De Forest was a pioneer of radio and motion pictures. He received more than 300 patents over the course of his lifetime, the most important of which was for a three-electrode vacuum tube, or triode, that he called...

Nervous system signals are transmitted electrically along individual neurons, but neurons are separated from each other by a tiny gap. Chemical messengers called neurotransmitters cross the gap between neurons. Neurotransmitters fit into...

This activity will build upon the concepts taught in the lesson The Strongest Pump of All. The activity will pull together the concepts of bioelectricity, electrical circuits, and biology. It will allow the students the opportunity to...

Described is a simple low cost home-made device that converts the radio wave energy from a mobile phone signal into electricity to light an LED. No battery or complex circuitry is required. The device can form the basis of a range of...

Your timing made you and your partner infamous bank robbers. Now, you need to use that timing to break out of jail. Your partner is about to flash you a signal, and exactly 45 seconds later the electric fence circuit will short out. Then...