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Definition of "Knife Switch" |
A style of switch that uses a movable thin metal element that is sandwiched between to metal contacts. A switch using hinged blades for contacts which enter or embrace fixed contact clips. Includes switches which have a movable blade which swivels to permit contact with each of several fixed contact clips. / Knife switch is a type of switch used to control the flow of electricity in a circuit.It is composed of a hinge which allows a metal lever,or knife,to be lifted from or inserted into a slot or jaw. The hinge and jaw are both fixed to an insulated base, and the knife has an insulated handle to grip at one end. Current flows through the switch when the knife is pushed into the jaw. Knife switches can take several forms, including single throw, in which the knife engages with only a single slot, and double throw, in which the knife hinge is placed between two slots and can engage with either one. Also, multiple knives may be attached to a single handle and can be used to activate more than one circuit simultaneously. / The total current flowing into any DC circuit node, also called a branch point, is always the same as the total current flowing out of the node. There are four current-carrying conductors a , b , c , and d leading into the node, and two conductors are e and f leading out. Direct currents in parallel add together arithmetically. Therefore, the total current flowing into the node is a + b + c + d , and the total current flowing out is e + f . These total currents, according to Kirchhoff's First Law , must be equal. |
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