Fischer Elektronik electrical components Germany Fischer Elektronik models Fischer Elektronik prices

Fischer Elektronik electrical components are devices for transmitting electrical energy or signals, typically composed of several wires or groups of wires. They consist of one or more mutually insulated conductors with an outer insulating protective layer, forming wires that transmit power or information from one point to another. Typically, they are cable-like ropes formed by twisting several wires or groups of wires (each group having at least two), where each group is mutually insulated and often twisted around a central core, with the entire assembly covered by a highly insulating sheath. Cables feature internal conductivity and external insulation.

Fischer Elektronik electrical component principles

Inductance is the ratio of the magnetic flux in and around a conductor carrying alternating current to the current producing this flux. When direct current flows through an inductor, only static magnetic field lines are present around it, which do not change over time; however, when alternating current flows through a coil, the surrounding magnetic field lines change with time. Analyzed according to Faraday's law of electromagnetic induction—where magnetism generates electricity—changing magnetic field lines induce an electromotive force (EMF) across the coil terminals, acting as a "new power source." When a closed circuit is formed, this induced EMF generates an induced current. According to Lenz's law, the total magnetic flux generated by the induced current attempts to oppose the change in the original magnetic flux. Since the change in the original magnetic flux stems from changes in the externally applied AC power source, the inductive coil objectively exhibits the characteristic of opposing changes in current in an AC circuit. Inductive coils have properties similar to inertia in mechanics, termed "self-inductance" in electrical engineering. Sparks often occur at the instant of opening or closing a knife switch, caused by the high induced EMF resulting from self-induction.

Fischer Elektronik electrical component structure

The simplest switch consists of two metal pieces called "contacts." When the two contacts touch, they complete the circuit for current flow; when they do not touch, the circuit is open. When selecting contact metals, their resistance to corrosion must be considered, as most metals form insulating oxides upon oxidation, preventing normal contact operation. Factors such as electrical conductivity, hardness, mechanical strength, cost, and toxicity must also be considered when selecting contact metals. Contacts are sometimes plated with corrosion-resistant metals, usually on the contact surfaces, to prevent performance degradation due to oxides. Sometimes, non-metallic conductive materials, such as conductive plastics, are used for contact surfaces. In addition to contacts, switches contain movable parts that make or break the contact connection. Switches can be classified into lever switches, push-button switches, rocker switches, etc., based on the type of movable part, which can also be other forms of mechanical linkages.

Fischer Elektronik electrical component composition

The printed circuit board mainly consists of pads, vias, mounting holes, traces, components, connectors, copper pours, and electrical boundaries. ① Pads: Metal holes used for soldering component pins. ② Vias: Including metallic vias and non-metallic vias; metallic vias are used to connect component pins between layers. ③ Mounting holes: Used to secure the printed circuit board. ④ Traces: Copper films forming electrical networks to connect component pins. ⑤ Connectors: Components used for connections between printed circuit boards. ⑥ Copper pours: Copper filling for ground networks, which can effectively reduce impedance. ⑦ Electrical boundaries: Used to define the dimensions of the printed circuit board; all components on the board must not exceed this boundary.

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