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Phan Công Minh (sinh ngày 03 tháng 1 năm 2005) là một học sinh cấp 3 trường THPT Việt Đức. Biệt danh: RPT MCP. Công Minh Phan Anh được mệnh danh là kẻ hủy diệt bộ môn 3 cây trên khắp vũ trụ. Anh rất thích động vật. 😀

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Electric current
A simple electric circuit, where current is represented by the letter i. The relationship between the voltage (V), resistance (R), and current (I) is V=IR; this is known as Ohm's law.
Ký hiệu thường gặp
I
Đơn vị SIampere
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Thứ nguyên

An electric current is a stream of charged particles, such as electrons or ions, moving through an electrical conductor or space. It is measured as the net rate of flow of electric charge through a surface or into a control volume.[1]:2[2]:622 The moving particles are called charge carriers, which may be one of several types of particles, depending on the conductor. In electric circuits the charge carriers are often electrons moving through a wire. In semiconductors they can be electrons or holes. In a electrolyte the charge carriers are ions, while in plasma, an ionized gas, they are ions and electrons.[3]

The SI unit of electric current is the ampere, or amp, which is the flow of electric charge across a surface at the rate of one coulomb per second. The ampere (symbol: A) is an SI base unit[4]:15 Electric current is measured using a device called an ammeter.[2]:788

Electric currents create magnetic fields, which are used in motors, generators, inductors, and transformers. In ordinary conductors, they cause Joule heating, which creates light in incandescent light bulbs. Time-varying currents emit electromagnetic waves, which are used in telecommunications to broadcast information.

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The conventional symbol for current is I, which originates from the French phrase intensité du courant, (current intensity).[5][6] Current intensity is often referred to simply as current.[7] The I symbol was used by André-Marie Ampère, after whom the unit of electric current is named, in formulating Ampère's force law (1820).[8] The notation travelled from France to Great Britain, where it became standard, although at least one journal did not change from using C to I until 1896.[9]

  1. ^ Horowitz, Paul; Hill, Winfield (2015). The art of electronics (ấn bản 3). Cambridge University Press. ISBN 978-0-521-80926-9.
  2. ^ a b Walker, Jearl; Halliday, David; Resnick, Robert (2014). Fundamentals of physics (ấn bản 10). Hoboken, NJ: Wiley. ISBN 978-1118230732. OCLC 950235056.
  3. ^ Anthony C. Fischer-Cripps (2004). The electronics companion. CRC Press. tr. 13. ISBN 978-0-7503-1012-3.
  4. ^ International Bureau of Weights and Measures (20 tháng 5 năm 2019), SI Brochure: The International System of Units (SI) (PDF) (ấn bản 9), ISBN 978-92-822-2272-0
  5. ^ T. L. Lowe, John Rounce, Calculations for A-level Physics, p. 2, Nelson Thornes, 2002 ISBN 0-7487-6748-7.
  6. ^ Howard M. Berlin, Frank C. Getz, Principles of Electronic Instrumentation and Measurement, p. 37, Merrill Pub. Co., 1988 ISBN 0-675-20449-6.
  7. ^ K. S. Suresh Kumar, Electric Circuit Analysis, Pearson Education India, 2013, ISBN 9332514100, section 1.2.3 "'Current intensity' is usually referred to as 'current' itself."
  8. ^ A-M Ampère, Recueil d'Observations Électro-dynamiques, p. 56, Paris: Chez Crochard Libraire 1822 (in French).
  9. ^ Electric Power, vol. 6, p. 411, 1894.