## ALEX Multimedia

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Electricity
Overview:
A brief overview of the history of the use of electricity and its discovery.

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Electrical Circuits
Overview:
This podcast will show how a closed circuit can be created and how a series and parallel circuit must be connected. It will also give three ways to use energy and three ways to conserve energy.

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Conductors and Insulators
Overview:
Do you know the difference between conductors and insulators? In this podcast Mrs. Huang's 4th grade class is going to show you the difference between the two. They will show you the materials used to test the items. Students will also show you which items they found were conductors and which ones were insulators. We hope you enjoy the podcast and learn some great information!

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Einstein Demonstrations- Photo-Electric Effect
Overview:
The message is the dual nature of light. When a gaseous element is raised to a high temperature, the atoms emit radiation having discreet wavelengths. The set of wavelengths for a given element is called its atomic spectrum. Einstein showed us that light can be described not only as a wave, like a water wave, but also as a particle. This understanding of light allowed us to understand why different elements have different fingerprint patterns of light known as spectra.

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Einstein Demonstrations- Photo-Electric Effect in Action
Overview:
The understanding that light interacts with matter like a particle also lead to modern information technology, like computers, TVs, and lasers. The communicator is a direct example of the Photo-Electric Effect, one of Einstein’s groundbreaking 1905 theses. This is the achievement for which he won the Noble Prize for Physics in 1921. The Photo-Electric Effect centers on the ability of light to free up electrons inside metal atoms. This induces electric current through out an illuminated piece of metal. The idea that light can physically disturb electrons denotes a particle nature of light. The energy produced is proportional to the frequency of light, not the intensity of light. This fact draws on the wave-like properties of light within the same interaction.

## Thinkfinity Multimedia

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Subject: Health
Title: Zapping Fish
Description: In this Science Update, from Science NetLinks, you'll hear about why fish generally are not electrocuted when lightning strikes the water they are swimming in. Science Updates are audio interviews with scientists and are accompanied by a set of questions as well as links to related Science NetLinks lessons and other related resources.
Thinkfinity Partner: Science NetLinks
Grade Span: 5,6,7,8,9,10,11,12