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By reversing the current direction in the rotating windings each half turn, a steady rotating force is produced. In a generator the commutator picks off the current generated in the windings, reversing the direction of the current with each half turn, serving as a mechanical rectifier to convert the alternating current from the windings to ...
For example, a "2-pole" switch has two separate, parallel sets of contacts that open and close in unison via the same mechanism. The number of "throws" is the number of separate wiring path choices other than "open" that the switch can adopt for each pole. A single-throw switch has one pair of contacts that can either be closed or open.
A "4-way" (intermediate) switch is a purpose built double pole, double throw (DPDT) switch, internally wired in manufacture to reverse the connections between the input and output and having only four external terminals. This switch has two pairs of "traveler" terminals that it connects either straight through, or crossed over (transposed, or ...
The cabinets for the reversing pole shunts and the brake resistors were mounted in front of the pantographs, towards the ends of the outer bodies. The 18-step flat track BBC stepping switch was mounted on the transformer. It was driven by a battery supplied direct-current motor. Initially the stepping switch was controlled by a crank handle ...
The Kiaman Reverse Superchron lasted from approximately the late Carboniferous to the late Permian, or for more than 50 million years, from around 12] The magnetic field had reversed polarity. The name "Kiaman" derives from the Australian town of Kiama , where some of the first geological evidence of the superchron was found in 1925.
A rotary switch is a switch operated by rotation. These are often chosen when more than 2 positions are needed, such as a three-speed fan or a CB radio with multiple frequencies of reception or "channels". A rotary switch consists of a spindle or "rotor" that has a contact arm or "spoke" which projects from its surface like a cam.
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