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Seipp 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; during conduction, current flows from the anode through the device to the cathode. The diode is one of the earliest semiconductor devices developed, and its applications are very widespread. Especially in various electronic circuits, by reasonably connecting diodes with components such as resistors, capacitors, and inductors to form circuits with different functions, it is possible to achieve AC rectification, demodulation of modulated signals, limiting and clamping, and voltage stabilization of power supply voltages.

Seipp electrical component principles

Inductance is the ratio of the magnetic flux in a conductor to the current producing this flux, generated when alternating current passes through the wire, creating alternating magnetic flux inside and around the conductor. When direct current passes through an inductor, only static magnetic field lines are present around it, which do not change with time; however, when alternating current passes through a coil, the surrounding magnetic field lines change with time. Analyzing based on Faraday's law of electromagnetic induction—where magnetism generates electricity—changing magnetic field lines induce an electromotive force (EMF) at both ends of the coil, acting as a "new power source." When a closed loop is formed, this induced EMF generates an induced current. According to Lenz's law, the total magnetic flux produced by the induced current attempts to oppose the change in the original magnetic flux. Since the change in the original magnetic flux originates from changes in the externally applied AC power source, objectively, the inductive coil has the characteristic of opposing changes in current in an AC circuit. Inductive coils have characteristics similar to inertia in mechanics, termed "self-induction" 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.

Seipp electrical component principles

When high-frequency current flows through a conductor, electric and magnetic fields are generated in the surrounding space. Based on the spatial distribution characteristics of the electromagnetic field, it can be divided into the near field, intermediate field, and far field. Let R be the distance from a point in space to the conductor. The region where R ﹤﹤ λ/2π is called the near field, where the electromagnetic field is closely linked to the current and voltage in the conductor. The region where R﹥﹥λ/2π is called the far field, where the electromagnetic field can propagate away from the conductor into space. Its changes lag behind the current and voltage on the conductor by a certain period, and the propagated electromagnetic waves are no longer directly linked to the current and voltage on the wire. The electromagnetic field in this region is called the radiation field. It must be pointed out that when the length of the wire L is much smaller than the wavelength λ, radiation is very weak; when the length of the wire L increases to be comparable to the wavelength, the current on the wire increases significantly, thereby forming stronger radiation. Transmitting antennas utilize this property of the radiation field to allow transmitted signals to radiate fully into space after passing through the transmitting antenna. How can a conductor become an effective radiating system? First, we analyze the situation on transmission lines. On parallel two-wire transmission lines, to ensure energy transmission without radiation, the structure of the two wires must be symmetrical, with currents at corresponding points on the lines being equal in magnitude and opposite in direction, and the distance between the two wires<π. To effectively radiate the electromagnetic field, this symmetry of the transmission line must be disrupted. Methods such as separating the two conductors at a certain angle or removing one side can break the conductor symmetry and produce radiation. By separating the open-circuit transmission line or the conductor at a distance of π/4 from the terminal in a straight line, the current on the terminal conductor becomes in-phase rather than anti-phase. This causes the radiation fields of this conductor segment at spatial points to superimpose in phase, constituting an effective radiation system. This is the simplest and most basic unit antenna, known as a half-wave dipole antenna, with a characteristic impedance of 85Ω. After electromagnetic waves are radiated from the transmitting antenna, they propagate in all directions. If a symmetric dipole is placed in the direction of electromagnetic wave propagation, an induced electromotive force will be generated on the antenna dipole under the action of the electromagnetic wave. If the antenna is connected to receiving equipment at this time, high-frequency current will be generated at the input terminal of the receiving equipment. Thus, the antenna acts as a receiver, converting electromagnetic waves into high-frequency current; in other words, the antenna functions as a receiving antenna. The quality of reception depends not only on the strength of the radio waves but also on the directionality of the antenna and the matching between the half-wave symmetric dipole and the receiving equipment.

Seipp electrical component principles

A fuel cell is an energy conversion device that converts the chemical energy stored in fuel and oxidant directly into electrical energy isothermally according to electrochemical principles, specifically the working principle of a galvanic cell. Therefore, the actual process is an oxidation-reduction reaction. A fuel cell mainly consists of four parts: the anode, cathode, electrolyte, and external circuit. Fuel gas and oxidant gas are introduced into the anode and cathode of the fuel cell, respectively. The fuel gas releases electrons at the anode; these electrons are conducted through the external circuit to the cathode, where they combine with the oxidant gas to form ions. Under the action of the electric field, the ions migrate through the electrolyte to the anode, react with the fuel gas, complete the circuit, and generate current. Meanwhile, due to the electrochemical reaction itself and the internal resistance of the battery, the fuel cell also generates a certain amount of heat. In addition to conducting electrons, the cathode and anode serve as catalysts for the oxidation-reduction reaction. When the fuel is a hydrocarbon, the anode requires higher catalytic activity. The cathode and anode are typically porous structures to facilitate the intake of reactant gases and the discharge of products. The electrolyte serves to transport ions and separate the fuel gas from the oxidant gas. To prevent mixing of the two gases, which would cause a short circuit within the battery, the electrolyte is typically a dense structure. The composition of a fuel cell is similar to that of a conventional battery. Its single cell consists of two electrodes (negative electrode, i.e., fuel electrode, and positive electrode, i.e., oxidant electrode) and an electrolyte. The difference is that the active materials in a conventional battery are stored inside the battery, thus limiting the battery capacity. In contrast, the positive and negative electrodes of a fuel cell do not contain active materials themselves but act merely as catalytic conversion elements. Therefore, a fuel cell is truly an energy conversion machine that transforms chemical energy into electrical energy. During operation, fuel and oxidant are supplied externally for the reaction. In principle, as long as reactants are continuously input and reaction products are continuously removed, the fuel cell can generate electricity continuously.

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