Red Filter Glasses

Enjoying this summer...
Now I made another tool to teach light and color in my Physics class.
Take a look:

Build an Electric Buzzer

In my previous post, I write about how to make an electric motor. Today it's time to build an electric buzzer:

"An electronic buzzer is one of the first electronic projects that you'll typically build. The simplest variation consists of a circuit with a battery, buzzer and switch. The buzzer sounds when you close the circuit and stops when you open the circuit. This is an ideal first project because it's simple, produces a verifiable result and is safe because it doesn't require a large current. It can be completed primarily with common household items and requires only a few special purchases."

Read more: How to Build a Buzzer for a Science Project | eHow.com http://www.ehow.com/how_5305594_build-buzzer-science-project.html#ixzz2MqMQ6Jln

In miniscience.com website you can find the description to create this project.
This is a photo of the project:

Follow this steps:

Prepare the materials. Scotch tape, 3v cell battery, 5v electric buzzer, scissors, and wire snips.

Remove the shrink wrap from the buzzer. The shrink wrap is made of polymer plastic film. It shrinks tightly over the buzzer when the shrink wrap is heated. You need to remove this from the buzzer.

Use the wire snips. You need to use the wire snips when snipping the wires from the buzzer. Snip the wires about an inch from outside the base of the buzzer.Position the buzzer. After you are done snipping the wires and removing all the excess wires from the buzzer, you need to set the buzzer upside down. This is the correct position for the buzzer.

Put the battery in place. The battery needs to be placed where the wires were previously located. You need to make sure that the positive and negative ends of your battery are in line with the positive and negative sides of your buzzer.

Hold the materials in place. You can use the scotch tape to hold everything. This is to secure it in place and make sure that none of what you just assembled will move.

By following these simple steps, you can experiment at home and make your own loud electric buzzer. You can in fact use old used materials that may be available in your house. This way, you don’t need to spend much on the materials.

Adapted from: howtodothings.com

Physics Buzz: How to Build a Spectrometer with Just Three Household Items

A PhysicsBuzz article show us how to build a spectrometer with simple stuff that we have at home!

"A CD has the very cool property of behaving like a reflective

diffraction grating. An ordinary diffraction grating is a grid of tiny,

evenly spaced opaque lines on an otherwise transparent material. Light can pass through the material but it has to bend around the lines, which are about the size of a wavelength of visible light." in PhysicsBuzz

Physics Buzz: How to Build a Spectrometer with Just Three Household Items

Shared via AddThis

----[Versão Portuguesa]----

Um artigo do PhysicsBuzz mostra como construir um espectrómetro com coisas simples que temos em casa!

"O CD tem a propiedade de comportar-se como uma rede de difracção por reflexão. Uma rede de difracção é como uma rede de pequenas linhas opacas, espaçadas uniformemente num material transparente. A luz pode passar através do material, mas tem que dobrar em redor das linhas, que são aproximadamente do tamanho de um comprimento de onda de a luz visível". in PhysicsBuzz

Para saber mais sobre como construir este espectrómetro, segue o endereço indicado.

---[Versión Española/Castelhana]----

Un artículo de PhysicsBuzz nos muestra cómo construir un espectrómetro con cosas simples que tenemos en casa!

"Un CD tiene la propiedad de comportarse como una red de difracción por reflexión. Una rejilla de difracción es como una red de pequeñas líneas opacas, espaciadas uniformemente, en un material transparente. La luz puede pasar a través del material, pero tiene que doblar en torno a las líneas, que son aproximadamente del tamaño de una longitud de onda de la luz visible". in PhysicsBuzz

Si quieres saber cómo construir, siga el enlace.