Eduqas GCSE Design and Technology key terms

For a rotary transmission, the ratio of input rotational speed to output rotational speed: $VR = RV_{\text{driver}}/RV_{\text{driven}}$. It has no unit.

A thin layer of wood applied to a surface to provide the appearance of that wood.

Applying a thin layer of wood to the surface of another material to improve its appearance.

A newly grown or extracted material that has not previously been used in a product.

The potential difference between two points in a circuit, measured in volts (V). It describes the energy transferred per unit charge between those points.

A soft, bulky layer of fibres used as padding, especially between the fabric layers of a quilted product.

A vertical column of loops in a knitted fabric.

A yarn running along the length of a woven fabric.

A flat ring placed beneath a fastener head or nut to spread its load over a larger area.

Making a component smaller or giving it a shape by removing material, for example by cutting or drilling.

Extra material included in a quantity calculation to cover losses such as cutting waste, trimming or mixing residue.

The ability of a textile to prevent liquid water from penetrating it under its intended conditions of use.

Resistance to wetting at a material’s surface; it does not necessarily prevent water passing through a fabric.

The ability of a material’s surface to resist wetting; this does not necessarily make the whole fabric waterproof.

A wax-based finish buffed to give timber a light sheen and enhance its grain.

A method of making fabric by interlacing two sets of yarns, warp and weft, at right angles.

A yarn running across the width of a woven fabric.

A joining process that melts and fuses the contacting regions of the parent metals to form a permanent joint.

The ability of a textile to resist air passing through it, helping protect the wearer against wind.

A finish that changes timber's colour while allowing its grain to remain visible.

An increase in hardness and strength caused by permanently deforming a metal without heating it.

A detailed technical drawing providing the dimensions and other information needed to manufacture a product or component.

A screw-shaped worm meshing with a toothed wheel, usually transmitting motion between shafts at right angles and providing a large speed reduction.

Fabric made by interlacing two sets of yarns at right angles: lengthwise warp yarns and crosswise weft yarns.

A fabric made by interlacing two sets of yarns at right angles: warp and weft.

A continuous strand of fibres or filaments used to make textile fabrics.

The number of usable pieces that can be obtained from a sheet or length of stock.