Category:GCSE Technology Revision Notes

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Electronics

Potential Difference

Many Circuits use a change in the potential difference to operate certain chips and functions. Potential difference is achieved by connecting two resistors in series. The difference is then worked out by the formula (R2/(R1+R2))*V with R1 being the top resistor and R2 the bottom one. ==Food Technology == File:Headline textItalic text

--Spicey94 10:03, 21 April 2009 (BST)[[Image:Media:Example.jpg]] == ==

Product Design

Resistant Materials (Woodwork)

Textiles

Useful Textiles revision website http://textiles4u.wikispaces.com/

Graphics

Pens&Markers for Graphic Design

Pencils

The Lead on Pencils are actually GRAPHITE composites, a mix of clay and graphite. Pencils are graded with (H) or (B) according to the hardness and blackness of this composite.

Soft Pencils are ones with less clay but more graphite, meaning that the composite is darker and richer, but will wear down easily. They are graded form 9B to HB.

Hard Pencils are ones with more clay but less graphite. The point of the pencil won't wear down easily. They are graded from H to 9H.

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