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electrolux electrical components consist of two conductors placed close to each other with a non-conductive insulating dielectric layer in between, forming a capacitor. When a voltage is applied across the two plates of the capacitor, it stores charge. The capacitance value is numerically equal to the ratio of the charge on one conductive plate to the voltage between the two plates. The basic unit of capacitance is the Farad (F). In circuit diagrams, the letter C is commonly used to represent capacitive elements; capacitors are components that store electric charge and electrical energy (electric potential energy). A system of conductors where one conductor is enclosed by another, or where all electric field lines originating from one conductor terminate on another conductor, is called a capacitor.

electrolux electrical component applications

The collector-emitter current can be regarded as controlled by the base-emitter current, which treats the bipolar junction transistor as a "current-controlled" device. It can also be viewed as controlled by the emitter-base junction voltage, treating it as a "voltage-controlled" device. In fact, these two perspectives are interconnected through the current-voltage relationship across the base-emitter junction, which can be represented by the current-voltage curve of the PN junction. In analog circuit design, the current-controlled perspective is sometimes adopted because, within a certain range, the bipolar junction transistor exhibits approximately linear characteristics. Within this range (referred to below as the "active region"), the collector current is approximately equal to a multiple of the base current, which greatly facilitates problem analysis and control of circuit functions. When designing certain basic circuits, it is assumed that the emitter-base voltage is an approximately constant value; at this time, the collector current is approximately equal to several times the base current, and the transistor acts as a current amplifier. However, in reality, the bipolar junction transistor is a relatively complex nonlinear device, and improper bias voltage distribution will cause distortion of the output signal. Furthermore, even when operating within a specific range, its current amplification factor is affected by factors including temperature. To design precise and reliable bipolar junction transistor circuits, the voltage-controlled perspective must be adopted. The voltage-controlled model introduces an exponential function to describe the voltage-current relationship; within a certain range, the functional relationship is approximately linear, allowing the transistor to be treated as a conductance element. Thus, the design of circuits such as differential amplifiers is simplified to a linear problem, so the approximate voltage-controlled perspective is also frequently selected. For translinear circuits, studying their current-voltage curves is crucial for analyzing device operation, so they are typically treated as a voltage-controlled model where transconductance is proportional to the collector current. Transistor-level circuit design primarily uses SPICE or other similar analog circuit simulators, so the complexity of the model does not pose a significant problem for designers. However, when manually analyzing analog circuit problems, it is not always possible to adopt exact calculation methods as in classical circuit analysis, making the use of approximation methods essential.

electrolux electrical component principles

Optical measurement and control systems vary widely depending on the principle of action of luminous flux on photoelectric elements. Based on the nature of the output quantity of the photoelectric element (optical measurement and control system), they can be divided into two categories: analog photoelectric sensors and pulse (switching) photoelectric sensors. Analog photoelectric sensors convert the measured quantity into a continuously changing photocurrent, exhibiting a single-valued relationship with the measured quantity. Analog photoelectric sensors can be classified into three major types based on the method of measuring the target object: transmission (absorption) type, diffuse reflection type, and shading (beam blocking) type. The transmission type refers to placing the measured object in the optical path, where light energy emitted by a constant light source passes through the measured object, is partially absorbed, and the transmitted light projects onto the photoelectric element. The diffuse reflection type refers to light emitted by a constant light source projecting onto the measured object, reflecting off its surface, and then projecting onto the photoelectric element. The shading type refers to the scenario where the luminous flux emitted by the light source is partially blocked by the measured object, changing the luminous flux projected onto the photoelectric element; the degree of change depends on the position of the measured object in the optical path. Photodiodes are the most common optical sensors. The appearance of a photodiode is similar to that of a standard diode. When there is no illumination, it behaves like a ordinary diode with a very small reverse current, known as the dark current of the photodiode. When illuminated, carriers are excited, generating electron-hole pairs, known as photo-carriers. Under the influence of an external electric field, these photo-carriers participate in conduction, forming a reverse current much larger than the dark current, known as photocurrent. The magnitude of the photocurrent is proportional to the light intensity, allowing an electrical signal that varies with light intensity to be obtained across the load resistor.

electrolux electrical component functions

Multimeters can not only measure the resistance of objects, AC and DC voltage, but also DC current. Some multimeters can even measure main parameters of transistors and the capacitance of capacitors. Proficient mastery of multimeter usage is one of the most basic skills in electronic technology. Common multimeters include analog (pointer-type) multimeters and digital multimeters. An analog multimeter is a multifunctional measuring instrument with a meter movement as its core component, where measurement values are read from the pointer indication. Digital multimeters display measurement values directly in numerical form on an LCD screen, making them easy to read; some also feature voice prompts. A multimeter is an instrument that integrates a voltmeter, ammeter, and ohmmeter using a shared meter movement. The DC current range of a multimeter is essentially a multi-range DC ammeter. Parallel connection of closed-loop shunt resistors to the meter movement expands its current range. The DC voltage range of a multimeter is a multi-range DC voltmeter. Series connection of voltage-dividing resistors to the meter movement expands its voltage range. Different voltage-dividing resistors correspond to different ranges. The meter movement of a multimeter is a magnetoelectric measuring mechanism, which can only pass DC. Diodes are used to convert AC to DC, thereby enabling AC measurement.

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