Energy can be converted from one form to another (e.g., mechanical to electrical).
By comparing the amount of power used to create electricity with the amount of electrical power actually generated, we can estimate how efficient we are at making electricity.
Different types of light bulbs (incandescent, LED) need different amounts of electrical power to generate the same amount of light. Some are more efficient than others.
The purpose of this experiment is to get a feel, literally, for how electrical power is generated, and to develop an appreciation for how this electricity is used. Students will investigate the power consumption of different light sources, while exploring the conversion of mechanical energy to electrical energy and making measurements on a simple electric circuit.
Is it possible to create a musical instrument that can be played without direct contact?
A photoresistor changes its resistance based on how much light it sees
A speaker can be run by sending an alternating current through it
An inverter can be used to produce a square wave
To create a Light Theremin, a musical instrument that can be played by using your hand to control how much light the instrument sees. Different amounts of light lead to different pitches, and with practice simple songs can be played.
You’ve probably run into this symbol before: +/-. You see it in the news when political poles are being discussed, or in science textbooks. You know it has something to do with “error”. But what does it really mean?