IMET electrical components Germany IMET model IMET price

IMET electrical components are electronic devices made from semiconductor materials (silicon, selenium, germanium, etc.). A diode has two electrodes: the positive electrode, also called the anode, and the negative electrode, also called the cathode. When a forward voltage is applied across the two terminals of the diode, it conducts; when a reverse voltage is applied, it blocks. The conduction and blocking of the diode are equivalent to the closing and opening of a switch. Diodes have unidirectional conductivity; when conducting, current flows from the anode through the device to the cathode. Diodes are among the earliest semiconductor devices developed and are widely used. Especially in various electronic circuits, reasonable connections using diodes along with resistors, capacitors, inductors, and other components form circuits with different functions, enabling AC rectification, demodulation of modulated signals, limiting and clamping, and voltage regulation of power supplies.

IMET electrical component functions

Multimeters can not only measure the resistance of objects but also AC and DC voltages. Some multimeters can even measure key parameters of transistors and the capacitance of capacitors. Proficient mastery of multimeter usage is one of the most basic skills in electronics technology. Common multimeters include analog multimeters and digital multimeters. An analog multimeter is a multifunctional measuring instrument with a meter movement as its core component; measurement values are read from the pointer on the meter movement. Digital multimeters display measurement values directly as numbers on an LCD screen, making them easy to read; some also feature voice prompts. A multimeter shares a single meter movement, integrating a voltmeter, ammeter, and ohmmeter into one instrument. The DC current range of a multimeter is a multi-range DC ammeter. Connecting shunt resistors in parallel with the meter movement expands its current range. The DC voltage range of a multimeter is a multi-range DC voltmeter. Connecting divider resistors in series with the meter movement expands its voltage range. Different divider resistors result in different ranges. The meter movement of a multimeter is a magnetoelectric measuring mechanism that can only pass DC current; diodes are used to convert AC to DC, thereby enabling AC measurements.

IMET 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 the 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 the temperature changes while the voltage across the varistor remains constant. 3. Nominal voltage: Refers to the voltage value across the varistor when a 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 clamping 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 under specified temperature and maximum DC voltage conditions. 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 the residual voltage to the nominal voltage. 8. Surge current capacity: Also known as surge current rating, it refers to the maximum pulse (peak) current allowed to pass through the varistor under specified conditions (specified time intervals and number of pulses, 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 resistive body. 19. 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.

IMET electrical component structure

A bipolar junction transistor is made by fabricating two closely spaced PN junctions on a semiconductor substrate. These two PN junctions divide the entire semiconductor into three parts: the base region in the middle, and the emitter and collector regions on either side. There are two arrangement types: PNP and NPN. Corresponding electrodes are drawn from the three regions: the base b, the emitter e, and the collector c. The PN junction between the emitter and base regions is called the emitter junction, and the PN junction between the collector and base regions is called the collector junction. The base region is very thin, while the emitter region is thicker with a high impurity concentration. In PNP type transistors, the emitter "emits" holes, whose movement direction is consistent with the current direction, so the emitter arrow points inward; in NPN type transistors, the emitter "emits" free electrons, whose movement direction is opposite to the current direction, so the emitter arrow points outward. The direction of the emitter arrow also indicates the conduction direction of the PN junction under forward voltage. Both silicon and germanium bipolar transistors come in PNP and NPN types. Transistor package forms and pin identification: Common transistor packages fall into two main categories: metal and plastic. Pin arrangements follow certain patterns. When viewed from the bottom with the three pins forming the vertices of an isosceles triangle, the order from left to right is e b c; for small and medium-power plastic transistors, orient the flat side towards you with the three pins facing down, and the order from left to right is e b c.

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