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Dyson Digital Slim for Canada and Continental Europe, essentially the same as the DC44 DC56 no image: 2013 Known as the Dyson Hard, cordless handstick similar to the DC44, for hard floors, powered by Dyson digital motor V2, has 5 cyclones. Weighs 2.92 pounds (1.32 kg), including a 22.2 V rechargeable lithium ion battery. DC57 no image: unknown
Often pins 1 and 2 will be negative, 3 and 4 positive for a higher current rating. Female connectors are used as supply and male connectors are used on loads. Most battery belts and power supplies output 13.2 V, but equipment can usually handle a range of 11–18 volts to accommodate battery packs of varying voltages and charging while operating.
Electrical contact is made by the flat surface of the ring or spade, while mechanically they are attached by passing a screw or bolt through them. The spade terminal form factor facilitates connections since the screw or bolt can be left partially screwed in as the spade terminal is removed or attached.
18th-century dictionaries and encyclopedias mention male and female screws or cochleae. [5] A 1736 builder's manual mentions screw genders as metaphors for convex and concave shapes: If the furrowed surface be convex, 'tis called a Male Screw; if concave, a Female; and where Motion is to be generated, the Male and Female are always join'd. [6]
Some adapters for wall outlets use an Edison screw, allowing a light socket to become an ungrounded electrical outlet (such as to install Christmas lights temporarily via a porch light), or to make a pull-chain switch with two outlets, or to split it for two lamps. Another adapter can make a wall outlet into a lamp holder (lamp socket).
The chair screw has a higher cost to manufacture than the rail spike, but has the advantage of greater fixing power—approximately twice that of a rail spike [18] —and can be used in combination with spring washers. [17] The chair screw was first introduced in 1860 in France (French tire-fond) and became common in continental Europe. [19]