A calculator is a small (often pocket-sized), usually inexpensive electronic device used to perform the basic operations of arithmetic. Modern calculators are more portable than most computers, though most PDAs are comparable in size to handheld calculators.
The calculator has its history in mechanical devices such as the abacus and slide rule. In the past, mechanical clerical aids such as abaci, comptometers, Napier's bones, books of mathematical tables, slide rules, or mechanical adding machines were used for numeric work. This semi-manual process of calculation was tedious and error-prone. The first digital mechanical calculator was invented in 1623 and the first commercially successful device was produced in 1820. The 19th and early 20th centuries saw improvements to the mechanical design, in parallel with analog computers; the first digital electronic calculators were created in the 1960s, with pocket-sized devices becoming available in the 1970s.
Modern calculators are electrically powered (usually by battery and/or solar cell) and vary from cheap, give-away, credit-card sized models to sturdy adding machine-like models with built-in printers. They first became popular in the late 1960s as decreasing size and cost of electronics made possible devices for calculations, avoiding the use of scarce and expensive computer resources. By the 1980s, calculator prices had reduced to a point where a basic calculator was affordable to most. By the 1990s they had become common in math classes in schools, with the idea that students could be freed from basic calculations and focus on the concepts.
Computer operating systems as far back as early Unix have included interactive calculator programs such as dc and hoc, and calculator functions are included in almost all PDA-type devices (save a few dedicated address book and dictionary devices).
In addition to general purpose calculators, there are those designed for specific markets; for example, there are scientific calculators which focus on operations slightly more complex than those specific to arithmetic – for instance, trigonometric and statistical calculations. Some calculators even have the ability to do computer algebra. Graphing calculators can be used to graph functions defined on the real line, or higher dimensional Euclidean space. They often serve other purposes, however.
(Taken from: Wikipedia.org Website: (http://en.wikipedia.org/wiki/Calculator))
A concept map is a diagram showing the relationships among concepts. They are graphical tools for organizing and representing knowledge.
Concepts, usually represented as boxes or circles, are connected with labeled arrows in a downward-branching hierarchical structure. The relationship between concepts can be articulated in linking phrases such as "gives rise to", "results in", "is required by," or "contributes to".
The technique for visualizing these relationships among different concepts is called "Concept mapping".
An industry standard that implements formal rules for designing at least a subset of such diagrams is the Unified Modeling Language (UML).
(From: wikipedia website (http://en.wikipedia.org/wiki/Concept_map)).
Diagram of Concept Map:
3D Technology
A 3-D (three-dimensional) film or S3D (stereoscopic 3D) film is a motion picture that enhances the illusion of depth perception. Derived from stereoscopic photography, a special motion picture camera system is used to record the images as seen from two perspectives (or computer-generated imagery generates the two perspectives), and special projection hardware and/or eyewear are used to provide the illusion of depth when viewing the film. 3-D films are not limited to feature film theatrical releases; television broadcasts and direct-to-video films have also incorporated similar methods, primarily for marketing purposes.
3-D films have existed in some form since the 1950s, but had been largely relegated to a niche in the motion picture industry because of the costly hardware and processes required to produce and display a 3-D film, and the lack of a standardized format for all segments of the entertainment business. Nonetheless, 3-D films were prominently featured in the 1950s in American cinema, and later experienced a worldwide resurgence in the 1980s and '90s driven by IMAX high-end theaters and Disney themed-venues. 3-D films became more and more successful throughout 2000–10, culminating in the unprecedented success of 3-D presentations of Avatar in December 2009 and January 2010.
Eclipse method
A pair of LCD shutter glasses used to view XpanD 3D films. |
1. Name the devices used by 3D Technology.
2. Name the devices to see 3D Movie
Should Do:
1. List the different between 2D and 3D.
2. Name the movie used 3D Technology.
Could Do:
1. Why people enjoy the 3D Technology?
2. Who are the people can not see the 3D Technology?
A wire in the shape of a circle with area A and carrying current I is a magnet, with a magnetic moment of magnitude equal to IA.
Changing Circuits
Q: Make a circuit with one very brightly lit bulb that can be turned on and off.
The circuit consist of choice of two types of battery, which is 1.5Volt or 3.0Volt, normal wire or twisted wire, choice of one bulb or two bulb and ON/OFF switch.
The bulb brightness depends on the battery voltage, if you put 1.5Volt battery the bulb is less bright. If you put 3Volt battery the bulb will be brighter. The reason, because with 3Volt the current flow is higher. Current is equal to voltage divided by resistor.
Assume the bulb resistor is two ohms
Therefore,
Concept Map: (Copied from http://cmapspublic.ihmc.us/rid=1121811339066_1756205171_2783/Electricity.pdf)
This software where teach you the use of an angle. To Learn more on this software, i did the steps on how to used this software. Just Click on this link congruent triangle .
URL for the site : http://nlvm.usu.edu/
Congruent Triangle Software
This video show the steps to used the Geogebra. The link below will redirect you the video. enjoy the video.
Tutorial for Geogebra Video