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A capacitor is a passive device on a circuit board that stores electrical energy in an electric field by virtue of accumulating electric charges on two close surfaces insulated from each other. This is a list of known capacitor manufacturers, their headquarters country of origin, and year founded. The oldest capacitor companies were founded ...
Ugreen (绿联) is a Chinese consumer electronics brand owned by Ugreen Group Ltd and based in Shenzhen, Guangdong. [2] [3] The brand and company was established by Zhang Qingsen in 2012, and specialises in USB hardware such as cables and AC adapters, as well as other categories of consumer electronics such as audio equipment and mobile accessories.
For brevity, the notation omits to always specify the unit (ohm or farad) explicitly and instead relies on implicit knowledge raised from the usage of specific letters either only for resistors or for capacitors, [nb 1] the case used (uppercase letters are typically used for resistors, lowercase letters for capacitors), [nb 2] a part's appearance, and the context.
Capacitors with an exposed and porous dielectric can be used to measure humidity in air. Capacitors are used to accurately measure the fuel level in airplanes; as the fuel covers more of a pair of plates, the circuit capacitance increases.
A decoupling capacitor provides a bypass path for transient currents, instead of flowing through the common impedance. [1] The decoupling capacitor works as the device’s local energy storage. The capacitor is placed between the power line and the ground to the circuit the current is to be provided.
The market for aluminum electrolytic capacitors in 2010 was around US$3.9 billion (approximately €2.9 billion), about 22% of the value of the total capacitor market of approximately US$18 billion (2008). In number of pieces these capacitors cover about 6% of the total capacitor market of some 70 to 80 billion pieces. [75]
A capacitor with the following text on its body: 105K 330V has a capacitance of 10 × 10 5 pF = 1 μF (K = ±10%) with a working voltage of 330 V. A capacitor with the following text: 473M 100V has a capacitance of 47 × 10 3 pF = 47 nF (M = ±20%) with a working voltage of 100 V.
Switched-capacitor resistor. The simplest switched-capacitor (SC) circuit is made of one capacitor and two switches S 1 and S 2 which alternatively connect the capacitor to either in or out at a switching frequency of . Recall that Ohm's law can express the relationship between voltage, current, and resistance as: