ELEKTRO KOHLE KOELN electrical components Germany ELEKTRO KOHLE KOELN models ELEKTRO KOHLE KOELN prices

ELEKTRO KOHLE KOELN electrical components refer to electronic components that can open a circuit, interrupt current, or direct it to other circuits. The most common switches are manually operated electromechanical devices with one or more electrical contacts. "Closed" contacts indicate conduction, allowing current flow; "open" switches indicate non-conduction, forming an open circuit and preventing current flow. The simplest switch consists of two metal pieces called "contacts"; when they touch, current forms a loop, and when they do not touch, the circuit is open. When selecting contact metals, their corrosion resistance must be considered, as most metals form insulating oxides after oxidation, preventing normal contact operation. Selection also requires considering electrical conductivity, hardness, mechanical strength, cost, and toxicity. Contacts are sometimes plated with corrosion-resistant metals, typically on the contact surface, to avoid performance degradation due to oxides. Non-metallic conductive materials, such as conductive plastics, are sometimes used for contact surfaces. In addition to contacts, switches have moving parts that make or break contact. Switches can be classified by their moving parts into lever switches, push-button switches, rocker switches, etc., and the moving parts can also be other types of mechanical linkages.

ELEKTRO KOHLE KOELN electrical component principles

Varactor diodes are a special type of diode. When forward bias is applied, significant current is generated, the PN (positive-negative) junction depletion region narrows, capacitance increases, producing a diffusion capacitance effect; when reverse bias is applied, a transition capacitance effect is produced. However, since leakage current occurs under forward bias, reverse bias is generally applied in applications. Varactor diodes, also known as voltage-controlled variable capacitors, are semiconductors whose junction capacitance changes with the applied voltage. That is, as variable capacitors, they can be applied in resonant circuits such as FM tuners and TV tuners, and in FM modulation circuits. Essentially, it can be viewed as a PN junction. If a reverse voltage V is applied to the PN junction (varactor diodes are used in reverse), electrons in the N-type semiconductor are drawn to the positive pole, and holes in the P-type semiconductor are drawn to the negative pole, forming a depletion layer with neither electrons nor holes. Let the width of this depletion layer be d, which varies with the reverse voltage V. Thus, as reverse voltage V increases, the depletion layer d widens, and the diode capacitance C decreases (according to C=kS/d); as reverse voltage decreases, the depletion layer width d narrows, and diode capacitance increases. Changes in reverse voltage V cause changes in the depletion layer, thereby changing the junction capacitance C of the voltage-controlled variable capacitor, achieving the desired effect. Varactor diodes are semiconductor devices made using the principle of variable capacitance across a PN junction, used as variable capacitors in high-frequency tuning, communication, and other circuits. Varactor diodes come in various package forms, including glass encapsulation (glass-sealed), plastic encapsulation (plastic-sealed), metal housing encapsulation (metal-sealed), and leadless surface mount packages. Typically, low-to-medium power varactor diodes use glass, plastic, or surface mount packages, while higher power varactor diodes mostly use metal seals. Common varactor diode parameters.

ELEKTRO KOHLE KOELN electrical component parameters

1. Voltage temperature coefficient: Refers to the rate of change of the nominal voltage of a varistor within a specified temperature range, i.e., the relative change in voltage across the varistor when temperature changes while the current through the varistor remains constant. 2. Current temperature coefficient: Refers to the relative change in current flowing through the varistor when temperature changes while the voltage across the varistor remains constant. 3. Nominal voltage: Refers to the voltage value across the varistor when DC current passes through it. 4. Voltage ratio: Refers to the ratio of the voltage generated by the current in the varistor to the voltage generated by the current in the varistor. 5. Maximum limiting voltage: Refers to the highest voltage value that the varistor can withstand across its terminals. 6. Leakage current: Also known as standby current, it refers to the current flowing through the varistor at a specified temperature and maximum DC current. 7. Residual voltage ratio: When the current through the varistor is at a certain value, the voltage generated across its terminals is called the residual voltage for that current value. The residual voltage ratio is the ratio of residual voltage to nominal voltage. 8. Surge current capacity: Also known as surge current, it refers to the maximum pulse (peak) current value allowed to pass through the varistor under specified conditions (specified time intervals and number of times, applying standard impulse current). 9. Static capacitance: Refers to the inherent capacitance of the varistor itself. 10. Insulation resistance: Refers to the resistance value between the leads (pins) of the varistor and the insulated surface of the resistor body. 21. Voltage nonlinearity coefficient: Refers to the ratio of the static resistance value to the dynamic resistance value of the varistor under a given applied voltage.

ELEKTRO KOHLE KOELN electrical component principles

Generators convert mechanical energy into electrical energy, and dry cells convert chemical energy into electrical energy. Generators and batteries themselves are not charged; their poles have positive and negative charges respectively, generating voltage (current is formed by the directional movement of charges under the action of voltage). Charges are inherently present in conductors; to generate current, only voltage needs to be applied. When conductors are connected to the battery poles, positive and negative charges are released to generate current; when the charges are exhausted, the current (and voltage) disappears. Dry cells and similar devices are called power sources. A device that converts AC to DC via transformers and rectifiers is called a rectified power supply. Electronic devices that provide signals are called signal sources. Crystal transistors can amplify incoming signals and transmit the amplified signals to subsequent circuits. For subsequent circuits, crystal transistors can also be regarded as signal sources. Rectified power supplies and signal sources are sometimes also called power sources.

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