mains operated equipment
21Electric power transmission — Electric transmission redirects here. For vehicle transmissions, see diesel electric transmission. 400 kV high tension transmission lines near Madrid Electric power transmission or high voltage electric transmission is the bulk transfer of… …
22Transformer types — Circuit symbols Transformer with two windings and iron core. Step down or step up transformer. The symbol shows which winding has more turns, but not usually the …
23Elevator — For other uses, see Elevator (disambiguation). A set of lifts in the lower level of a London Underground station. The arrows indicate each elevator s position and direction of travel …
24Railway signal — Not to be confused with Railway signalling. A signal is a mechanical or electrical device erected beside a railway line to pass information relating to the state of the line ahead to train/engine drivers. The driver interprets the signal s… …
25All American Five — The All American Five was a mass produced, superheterodyne radio receiver with five vacuum tubes first designed and produced in the USA in the 1930s.The radio was called the All American Five because the design represented the majority of radios… …
26coal mining — Coal was very important in the economic development of Britain. It was used as fuel in the factories built during the Industrial Revolution and continued to be important until the 1980s. The main coalfields are in north east England, the north… …
27BMX racing — is a type of off road bicycle racing. The format of BMX was derived from motocross racing. BMX bicycle races are sprint races on purpose built off road single lap race tracks. The track usually consists of a starting gate for up to eight racers,… …
28Transformer — This article is about the electrical device. For the toy line franchise, see Transformers. For other uses, see Transformer (disambiguation). Pole mounted distribution transformer with center tapped secondary winding. This type of transformer is… …
29Fluorescent lamp — A fluorescent lamp or fluorescent tube is a gas discharge lamp that uses electricity to excite mercury vapor. The excited mercury atoms produce short wave ultraviolet light that then causes a phosphor to fluoresce, producing visible light.Unlike… …
30Thermostat — This article is about the temperature regulating device. For the French cooking oven temperature scale, see Gas Mark#Other cooking temperature scales. Honeywell s iconic The Round model T87 thermostat, one of which is in the Smithsonian …
