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capacitance, in electricity, capability of a body, system, circuit, or device for storing electric charge. Capacitance is expressed as the ratio of stored charge in coulombs to the impressed potential difference in volts. The resulting unit of capacitance is the farad [for Michael Faraday]. In an electric circuit the device designed to store charge is called a capacitor. An ideal capacitor, i.e., one having no resistance or inductance, may be spoken of as a capacitance. When an alternating current flows through a capacitor, the capacitor produces a reactance that resists the current (see impedance). While every element of a circuit has some capacitance, it is a goal of good design to reduce such unwanted or stray capacitance to a minimum.

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Capacitance is a measure of a component's ability to store electrical energy in an electric field formed between two conductive surfaces separated by an insulating material, known as a dielectric. It is determined by the size of the conductive surfaces, the distance between them, and the properties of the dielectric material. Capacitance is typically measured in farads (F) and is used to store and release electrical energy in electronic circuits.

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Q: Define capacitance with respect to physical structure and electrical function?
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What happens to capacitance if voltage is increased?

If voltage is increased, capacitance remains constant. Capacitance is determined by the physical properties of the capacitor, such as plate area, distance between plates, and permittivity of the material, and is not affected by changes in voltage applied across the capacitor.


What happens to the capacitance fi the charge on the plates of a capacitor is doubled?

If the charge on the plates of a capacitor is doubled, the capacitance remains the same. Capacitance is determined by the physical dimensions and properties of the capacitor, such as the area of the plates, the distance between them, and the material between them.


What is the difference between physical structure and logical structure of a disk?

Physical structure refers to the actual layout of data on the disk, including sectors, tracks, and cylinders. Logical structure refers to how the operating system organizes and accesses data on the disk, such as partitions, file systems, and directories.


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A physical connection medium is used to physically transmit data between devices in a network. It provides a pathway for electrical or optical signals to travel from one device to another, ensuring reliable communication. The choice of connection medium can impact factors such as data transfer speed, distance limitations, and susceptibility to interference.


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Most sensors have an electrical output because electrical signals are easy to transmit, process, and analyze in electronic systems. Converting physical measurements into electrical signals allows for easier integration with other electronic devices and systems for data processing and feedback control. Additionally, electrical signals are less prone to interference and noise compared to other types of signals.

Related questions

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A capacitor is a device that stores an electrical charge, or if you prefer- resists any change in voltage applied to it. Capacitance is a measure of the size or ability of a capacitor to do that. This is the Farad


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