Accu-Profi electrical components Germany Accu-Profi model Accu-Profi price

Accu-Profi electrical components are products whose raw material molecular composition is not altered during factory processing, and can be referred to as components. Components belong to devices that do not require an energy source. They include: resistors, capacitors, and inductors. Circuit-type components include diodes and resistors; connection-type components include connectors, sockets, connecting cables, and printed circuit boards (PCB). Devices are products whose raw material molecular structure is altered during factory production and processing. Devices are divided into active devices and discrete devices. The main characteristic of active devices is that they consume electrical energy and require an external power supply. Discrete devices are divided into bipolar junction transistors, field-effect transistors, thyristors, semiconductor resistors, and capacitors. shi

Accu-Profi 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 is applied. 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 under specified temperature and maximum DC current 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, 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 resistive body. 12. 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.

Accu-Profi electrical component types

There are many types of loudspeakers. According to their transduction principle, they can be divided into electrodynamic (moving-coil), electrostatic (capacitive), electromagnetic (reed), piezoelectric (crystal), etc.; the latter two are mostly used in rural wired broadcasting networks. According to frequency range, they can be divided into low-frequency, mid-frequency, and high-frequency loudspeakers, which are often used as combination loudspeakers in speaker enclosures. According to transduction mechanism and structure, they are divided into moving-coil (electrodynamic), capacitive (electrostatic), piezoelectric (crystal or ceramic), electromagnetic (spring-loaded), ionophone, and pneumatic loudspeakers. Electrodynamic loudspeakers have advantages such as good electro-acoustic performance, sturdy structure, and low cost, and are widely used. According to sound radiation material, they are divided into cone, horn, and diaphragm types. According to cone shape, they are divided into circular, elliptical, dual-cone, and rubber surround types. According to operating frequency, they are divided into bass, midrange, and treble; some are further divided into recorder-specific, TV-specific, ordinary, and hi-fi loudspeakers. According to voice coil impedance, they are divided into low-impedance and high-impedance types. According to effect, they are divided into direct-radiating and ambient sound types. Loudspeakers are divided into built-in and external loudspeakers, with external loudspeakers generally referring to speaker enclosures. Built-in loudspeakers refer to MP4 players having built-in speakers, allowing users to listen to the sound from the MP4 player not only through the headphone jack but also through the built-in speakers. MP7 players with built-in speakers can operate without external speakers and avoid the inconvenience of wearing headphones for extended periods.

Accu-Profi electrical component principles

The construction of a mercury switch is very simple. The exterior is a sealed cylindrical insulating housing containing approximately one-fifth mercury. Two wires leading out from the inside are fixed at one end of the housing. This constitutes a mercury switch. Due to gravity, the mercury bead flows to the lower part of the container. If it simultaneously contacts both electrodes, the switch closes the circuit, turning the switch on. The shape of the container also affects the conditions under which the mercury bead contacts the electrodes.

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