Ge Cema electrical components, German Ge Cema models, Ge Cema prices

Ge Cema electrical components are resistive devices with nonlinear voltage-current characteristics, primarily used for voltage clamping when the circuit is subjected to overvoltage, absorbing excess current to protect sensitive devices. The resistive body material of a varistor is a semiconductor, making it a type of semiconductor resistor. The widely used "zinc oxide" varistors are composed of divalent zinc and hexavalent oxygen. Therefore, from a materials perspective, zinc oxide varistors are a type of "II-VI group oxide semiconductor." In Taiwan, varistors are called "surge absorbers" and are sometimes also referred to as "electric shock (surge) suppressors (absorbers)." A varistor is a voltage-limiting protection device. Utilizing the nonlinear characteristics of the varistor, when an overvoltage appears across its two terminals, the varistor can clamp the voltage to a relatively fixed value, thereby protecting the downstream circuit. The main parameters of a varistor include: varistor voltage, current handling capacity, junction capacitance, and response time. The response time of a varistor is in the ns range, which is faster than that of a gas discharge tube and slightly slower than that of a TVS tube. Generally, this response speed meets the requirements for overvoltage protection in electronic circuits. The junction capacitance of a varistor is typically in the range of hundreds to thousands of Pf, making it unsuitable for direct application in high-frequency signal line protection in many cases. When applied in AC circuit protection, the larger junction capacitance increases leakage current, which must be fully considered in protective circuit design. Varistors have a large current handling capacity, though smaller than that of gas discharge tubes. Varistors, abbreviated as VDR, are nonlinear overvoltage protection semiconductor components sensitive to voltage.

Ge Cema electrical component functions

The self-induced electromotive force in an inductor coil always opposes changes in the current within the coil. Inductor coils impede alternating current; the magnitude of this impedance is called inductive reactance xl, measured in ohms. Its relationship with inductance l and AC frequency f is xl=2πfl. Inductors are mainly classified into high-frequency choke coils and low-frequency choke coils. An inductor coil connected in parallel with a capacitor forms an lc tuned circuit. When the natural oscillation frequency f0 of the circuit equals the frequency f of the non-AC signal, the inductive reactance equals the capacitive reactance. Consequently, electromagnetic energy oscillates back and forth between the inductor and the capacitor; this is the resonance phenomenon of the lc circuit. At resonance, the inductive and capacitive reactances are equal in magnitude but opposite in direction, resulting in minimum total impedance and maximum current in the circuit (for AC signals where f="f4"). The lc resonant circuit has frequency selection capabilities, allowing it to select AC signals at a specific frequency f.

Ge Cema electrical component characteristics

The static characteristics of a sensor refer to the relationship between the output and input quantities for static input signals. Since the input and output quantities are independent of time in this state, their relationship, i.e., the static characteristics of the sensor, can be described by an algebraic equation without time variables, or by a characteristic curve plotted with the input quantity on the horizontal axis and the corresponding output quantity on the vertical axis. The main parameters characterizing the static characteristics of a sensor include: linearity, sensitivity, hysteresis, repeatability, and drift. (1) Linearity: Refers to the degree to which the actual relationship curve between the sensor's output and input deviates from the fitted straight line. It is defined as the ratio of the maximum deviation between the actual characteristic curve and the fitted straight line over the full scale range to the full-scale output value. (2) Sensitivity: Sensitivity is an important indicator of a sensor's static characteristics. It is defined as the ratio of the increment in the output quantity to the corresponding increment in the input quantity that causes it. S denotes sensitivity. (3) Hysteresis: Hysteresis is the phenomenon where the input-output characteristic curves do not coincide when the input quantity changes from small to large (forward stroke) and from large to small (reverse stroke). For the same magnitude of input signal, the output signals for the forward and reverse strokes are unequal; this difference is called the hysteresis error. (4) Repeatability: Repeatability refers to the degree of inconsistency in the characteristic curves obtained when the sensor's input quantity undergoes continuous multiple full-scale changes in the same direction. (5) Drift: Sensor drift refers to the phenomenon where the sensor's output changes over time while the input quantity remains constant. There are two causes of drift: one is the sensor's own structural parameters, and the other is the surrounding environment (such as temperature, humidity, etc.). (6) Resolution: When the sensor's input slowly increases from a non-zero value, the output undergoes an observable change after exceeding a certain increment; this input increment is called the sensor's resolution, i.e., the minimum input increment. (7) Threshold: When the sensor's input slowly increases from zero, the output undergoes an observable change after reaching a certain value; this input value is called the sensor's threshold voltage.

Ge Cema electrical component principles

A DC power supply has two electrodes: positive and negative. The positive electrode has a higher potential, and the negative electrode has a lower potential. When these two electrodes are connected to a circuit, they maintain a constant potential difference across the circuit terminals, thereby forming a current from the positive to the negative electrode in the external circuit. Relying solely on the difference in water levels cannot maintain a steady water flow; however, using a pump to continuously move water from a lower level to a higher level maintains a certain water level difference, forming a steady water flow. Similarly, relying solely on the electrostatic field generated by electric charges cannot maintain a steady current. With a DC power supply, non-electrostatic forces (abbreviated as "non-electrostatic force") can be used to move positive charges from the negative electrode at a lower potential, through the interior of the power supply, back to the positive electrode at a higher potential, thereby maintaining the potential difference between the two electrodes and forming a steady current. Therefore, a DC power supply is an energy conversion device that converts other forms of energy into electrical energy to supply the circuit, maintaining the steady flow of current.

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