Category Archives: Design and Technology

1.4 Fats and Oils

 Main types of fats: Animal (e.g butter, lard, suet) Fish (e.g Omega 3) Vegetable (e.g olive oil, peanut oil) A general rule is that at room temperature fats are solid or semi solid and oils are liquid. There are many … Continue reading

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1.3 Proteins

1.3 Proteins Proteins are made of small units called amino acids that are linked together. When the protein is heated, the links change, causing the structure of the food to alter. On example would be the solidifying of egg white … Continue reading

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iGCSE Food Technology: The Functions and Properties of Food: Starch and Sugars

1.1 Starch  There are two types of carbohydrates: Starch – found in bread, flour, potatoes, rice Sugars – found in fruits, drinks, honey Types of starches: Wheat flour Corn flour Arrowroot Functions of Starches: Bulking agent: flour is often the … Continue reading

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SI Prefixes

Prefix Symbol 1000m 10n Decimal English word Since yotta Y  10008  1024 1000000000000000000000000 septillion 1991 zetta Z  10007  1021 1000000000000000000000 sextillion 1991 exa E  10006  1018 1000000000000000000 quintillion 1975 peta P  10005  1015 1000000000000000 quadrillion 1975 tera T  10004  1012 … Continue reading

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Binary

Basics: It is a series of ONs and OFFs: This is what makes electrical gadgets function. Digital electronics only has these two states. Bases: A thousand is ten to the base 3: 10^3. A hundred is ten to the base … Continue reading

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BASIC

BASIC: Acronym for: Beginners All-purpose Symbolic Instruction Code. Developed by John Kemeney and Thomas Kurtz in the mid 1960s at Dartmouth College. One of the earliest and simplest high level programming languages. During the 1970s it was the principle programming … Continue reading

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Analogue and Digital

Systems: Basics: A system is a combination of elements that work together to achieve a specific outcome. Analogue: Such systems work in a continuous way. Digital: Such systems work in a non-continuous way. Digital circuits can handle anything as long … Continue reading

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Infrared Technology

Basics: Depends upon infrared waves which are a type of electromagnetic waves. It has a slightly longer wavelength than red light. It has many applications: Night vision. Thermography. Hyperspectral and other types of imaging. Tracking. Heating. Communications. Spectroscopy. Meteorology. Climatology. … Continue reading

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Moral

Consumerism: Consumer society: Filled with brand new products that we are told we ‘need’ through advertising. Vast range of products satisfying almost any want are readily available. Products are designed for a mass market: Thus there are multi-national companies selling … Continue reading

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Environmental

Introduction: Becoming very important as a result of major manufacturing industries and mass consumerism: Consumerism is a social and economic order that encourages the purchase of ever greater amounts of goods and services. It is important to sustain the world’s … Continue reading

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