The term "electromotive force" originally referred to the strength with which positive and negative charges could be separated (i.e. moved, hence "electromotive"), and was also called "electromotive power" (although it is not a power in the modern sense). (c.f. Oxford English Dictionary, "electromotive force".) Maxwell's 1865 explication of what are now called Maxwell's equations used the term "electromotiv ...

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Electromotive force, Electromotive force - Terminology, Electromotive force - Generation of emfs, Electromotive force - Effects, Electromotive force - Distinction between emf and p.d.

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Electromotive force, Electromotive force - Terminology, Electromotive force - Generation of emfs, Electromotive force - Effects, Electromotive force - Distinction between emf and p.d.

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Commonly, emf is generated by electrochemical reaction (e.g., a battery or a fuel cell), absorption of radiant or thermal energy (e.g., a solar cell or a thermocouple), or electromagnetic induction (e.g., a generator or an alternator). Electromagnetic induction is a means of converting mechanical energy, i.e., energy of motion into electrical energy. The emf generated in this way is often referred to as motional emf. Motional emf is ultimately due to the electrical effect of a changing magnetic field. In the presence of a chang ...

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Electromotive force, Electromotive force - Terminology, Electromotive force - Generation of emfs, Electromotive force - Effects, Electromotive force - Distinction between emf and p.d.

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This article lists conversion factors between a number of units of measurement. Conversion of units - Conversion techniques. The simplest way to convert from one unit to another is to carry through the units themselves in the mathematical operation. To illustrate this process, consider the following examples. You would like to convert 6 feet into metres. Consulting the table below and finding that one foot is exactly 0.3048 metre, you can now perform the mathematical conversion: Notice that th ...

Including:

Conversion of units - Conversion techniques Conversion of units - Rounding of results Conversion of units - Tables of conversion factors
Conversion of units - Length Conversion of units - Area Conversion of units - Volume Conversion of units - Angle Conversion of units - Mass Conversion of units - Time Conversion of units - Speed Conversion of units - Acceleration Conversion of units - Force Conversion of units - Pressure Conversion of units - Energy or work Conversion of units - Power Conversion of units - Angular momentum Conversion of units - Electric current Conversion of units - Electric charge Conversion of units - Electromotive force Conversion of units - Electrical resistance Conversion of units - Dynamic viscosity Conversion of units - Kinematic viscosity Conversion of units - Temperature

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Key: ≡ — definition = — exactly equal to ≈ — approximately equal to (digits) — indicates the digits repeat infinitely Conversion of units - Length. ≈ 206 264.806 25 AU = 3.261 563 776 9 ± 6×10-10 light-years Conversion of units - Area. Conversion of units - Volume. Conversion of units - An ...

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Conversion of units, Conversion of units - Conversion techniques, Conversion of units - Rounding of results, Conversion of units - Tables of conversion factors, Conversion of units - Length, Conversion of units - Area, Conversion of units - Volume, Conversion of units - Angle, Conversion of units - Mass, Conversion of units - Time, Conversion of units - Speed, Conversion of units - Acceleration, Conversion of units - Force, Conversion of units - Pressure, Conversion of units - Energy or work, Conversion of units - Power, Conversion of units - Angular momentum, Conversion of units - Electric current, Conversion of units - Electric charge, Conversion of units - Electromotive force, Conversion of units - Electrical resistance, Conversion of units - Dynamic viscosity, Conversion of units - Kinematic viscosity, Conversion of units - Temperature

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The simplest way to convert from one unit to another is to carry through the units themselves in the mathematical operation. To illustrate this process, consider the following examples. You would like to convert 6 feet into metres. Consulting the table below and finding that one foot is exactly 0.3048 metre, you can now perform the mathematical conversion: Notice that the "foot" units canceled out, leaving only metres, the desired result. (Since 0.3048 metre per foot have infinite precision, the precision of the answer is deter ...

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Conversion of units, Conversion of units - Conversion techniques, Conversion of units - Rounding of results, Conversion of units - Tables of conversion factors, Conversion of units - Length, Conversion of units - Area, Conversion of units - Volume, Conversion of units - Angle, Conversion of units - Mass, Conversion of units - Time, Conversion of units - Speed, Conversion of units - Acceleration, Conversion of units - Force, Conversion of units - Pressure, Conversion of units - Energy or work, Conversion of units - Power, Conversion of units - Angular momentum, Conversion of units - Electric current, Conversion of units - Electric charge, Conversion of units - Electromotive force, Conversion of units - Electrical resistance, Conversion of units - Dynamic viscosity, Conversion of units - Kinematic viscosity, Conversion of units - Temperature

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A polarised material consists of atoms or molecules with electric dipole moment. It can be produced by cooling down material composed of long molecule chains with electric dipole moment so that so-called domains are formed. Electrets are prepared by cooling a suitable dielectric material in a strong electric field, after heating it to a high temperature. This process repositions the charge carriers or orients the dipoles in the material, then fixes them in position. The effect is not permanent, the charge decays exponentially, but the ...

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Electret, Electret - Similarity to capacitors, Electret - Natural abundance, Electret - Electret types, Electret - Manufacture, Electret - Applications, Electret - Patents

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There are two types of electrets: Real-charge electrets concentrate the positive charge carriers on one side of the object and the negative ones on the other side. Dipolar-charge electrets have homogenous distribution of electric charge through the object, but their carriers, dipoles, are aligned. These are also known as ferroelectric materials. Some d ...

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Electret, Electret - Similarity to capacitors, Electret - Natural abundance, Electret - Electret types, Electret - Manufacture, Electret - Applications, Electret - Patents

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In physics, the weber (symbol: Wb) is the SI unit of magnetic flux. It is named after the German physicist Wilhelm Eduard Weber (1804 - 1891). The weber may be defined in terms of Faraday's law, which relates a changing magnetic flux through a loop to the electric field around the loop. A change in flux of one weber per second will induce an electromotive force of one volt. In SI base units, the dimensions of the weber are kg·m2·s-2·A-1. In derived units, they are volt-seconds (V·s). The weber is a large unit, equal to 1 T m2 = Including:

Weber unit - SI multiples

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Most simply, an antenna (U.S.) or aerial (UK) is an electronic component designed to transmit or receive radio waves. The words "antenna" and "aerial" are used throughout this article with precisely the same meaning. More specifically, an antenna is an arrangement of conductors designed to radiate (transmit) an electromagnetic field in response to an applied alternating electromotive force ...

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Antenna radio - Overview Antenna radio - Antenna parameters
Antenna radio - Resonant frequency Antenna radio - Gain Antenna radio - Bandwidth Antenna radio - Impedance Antenna radio - Polarization Antenna radio - Efficiency Antenna radio - overview of antenna parameters Antenna radio - Transmission and reception
Antenna radio - A few basic antenna models Antenna radio - Combination of multiple antennas

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If the rate of change of current in a circuit is one ampere per second and the resulting electromotive force is one volt, then the inductance of the circuit is one henry. 1 H = Wb/A = 1 m2·kg·s–2·A–2 ...

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Henry inductance, Henry inductance - Definition, Henry inductance - SI multiples, Henry inductance - Explanation

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The above equation can be rearranged as follows: Taking the time derivative of both sides of the equation yields: In most physical cases, the inductance is constant with time and so By Faraday's Law of Induction we have: where is the Electromotive force (emf) and v is the induced voltage. Note that the emf is opposite to the induced voltage. Th ...

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Inductance, Inductance - Definition, Inductance - Properties of inductance, Inductance - Permeability, Inductance - Coupled inductors, Inductance - Vector field theory derivations, Inductance - Mutual inductance, Inductance - Self-inductance, Inductance - Usage

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Inductor - Overview. Inductance (measured in henrys) is an effect which results from the magnetic field that forms around a current carrying conductor. Current flowing through the inductor creates a magnetic field which has an associated electromotive field which opposes the applied voltage. This counter electromotive force (emf) is generated which opposes the change in voltage applied to the inductor and current in the inductor resists the change but does rise. This is known as inductive reactance. It is opposite in phase to capacitive reactance. Inductance can be increased by looping the conductor into a coil wh ...

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Inductor, Inductor - Physics, Inductor - Overview, Inductor - Stored energy, Inductor - Hydraulic model, Inductor - In electric circuits, Inductor - Inductor networks, Inductor - Q Factor, Inductor - Formulae, Inductor - Inductor construction, Inductor - Applications, Inductor - Synonyms

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If the rate of change of current in a circuit is one ampere per second and the resulting electromotive force is one volt, then the inductance of the circuit is one henry. 1 H = Wb/A = 1 m2·kg·s–2·A–2 = 1 V·s/A ...

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Henry inductance, Henry inductance - Definition, Henry inductance - SI multiples, Henry inductance - Explanation

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Teleforce applications and particle beam device must meet four conditions and involved four inventions: Produce an electromotive force, in particular a method and process for producing very great electrical force (in the range of 50,000,000 volts electrical potential). A method and apparatus to produce rays"and other manifestations of energy" in natural media (e.g., the free air). Generate a force amplification or a method of amplifying manifestations of force. and, Generate an electri ...

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Teleforce, Teleforce - Introduction, Teleforce - Conditions and inventions, Teleforce - Principles, Teleforce - Conspiracy, Teleforce - Quotes

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An important thing to remember is that the process of making a conversion cannot give you any more precise results than what you started with. While many of the conversion factors given in the tables below are exact, and others while not exact contain many significant digits, all the numbers you get after performing calculations on a calculator or with pencil and paper are not meaningful. After using these conversion factors, be sure to round off the results appropriately. See also. False precision

The electrical potential difference can be thought of as the ability to move electrical charge through a resistance. In essence, the volt measures how much kinetic energy each electron carries. The number of electrons is measured by the charge, in coulombs. Thus the volt is multiplied by the current flow, in amperes which are one coulomb per second, to yield the total electrical power in the current, in Watts. At a time in physics when the word force was used loosely, the potential difference was named the electromotive force or emf - a term which is still used in certain contexts. Volt - Electrical ...

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Volt, Volt - Definition, Volt - Explanation, Volt - Electrical potential difference voltage, Volt - Hydraulic analogy, Volt - Technical definition, Volt - Useful formulae, Volt - DC circuits, Volt - AC circuits, Volt - AC conversions, Volt - Total voltage, Volt - Voltage drops, Volt - Examples, Volt - Voltage sources, Volt - Common voltages, Volt - Measuring instruments, Volt - History of the volt

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In 1800, as the result of a professional disagreement over the galvanic response advocated by Luigi Galvani, Alessandro Volta developed the so-called Voltaic pile, a forerunner of the battery, which produced a steady electric current. Volta had determined that the most effective pair of dissimilar metals to produce electricity was zinc and silver. In the 1880s, the International Electrical Congress, now the International Electrotechnical Commission (IEC), approved the volt for electromotive force. The volt was defined as the potential difference across a conductor when a current ...

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Volt, Volt - Definition, Volt - Explanation, Volt - Electrical potential difference voltage, Volt - Hydraulic analogy, Volt - Technical definition, Volt - Useful formulae, Volt - DC circuits, Volt - AC circuits, Volt - AC conversions, Volt - Total voltage, Volt - Voltage drops, Volt - Examples, Volt - Voltage sources, Volt - Common voltages, Volt - Measuring instruments, Volt - History of the volt

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Transformer - Flux coupling. A simple single phase transformer consists of two electrical conductors called the primary winding and the secondary winding. The primary is fed with a varying (alternating or pulsed continuous) electric current which creates a varying magnetic field around the conductor and in the magnetic core (shaded grey). The secondary, which is placed in this varying magnetic flux, develops an electromotive force or EMF. If the ends of the secondary are connected toge ...

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Transformer, Transformer - Introduction, Transformer - Basic principles, Transformer - Flux coupling, Transformer - Electrical laws, Transformer - Invention, Transformer - Practical considerations, Transformer - Classification, Transformer - Losses, Transformer - High frequency operation, Transformer - Construction, Transformer - Cores, Transformer - Windings, Transformer - Insulation, Transformer - Shielding, Transformer - Coolant, Transformer - Terminals, Transformer - Transformer designs, Transformer - Autotransformers, Transformer - Polyphase transformers, Transformer - Resonant transformers, Transformer - Instrument transformers, Transformer - Pulse transformers, Transformer - RF transformers, Transformer - Uses of transformers

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In science and technology, a battery is a device that stores energy and makes it available in an electrical form. Batteries consist of electrochemical devices such as one or more galvanic cells (or, more recently, fuel cells). The first possible evidence of batteries in history are the Baghdad Batteries from sometime between 250 BCE and 640 CE. The modern development of batteries started with the Voltaic pile developed by the Italian physicist Alessandro Volta in 1800. The worldwide battery industry generates 48 billion dollars ...

Including:

Battery electricity - Cell vs. battery Battery electricity - Electrical component Battery electricity - Battery concepts
Battery electricity - Battery lifetime Battery electricity - Battery explosion
Battery electricity - Common battery types
Battery electricity - Rechargeable and disposable batteries Battery electricity - Homemade cells Battery electricity - Traction batteries Battery electricity - Flow batteries
Battery electricity - Common battery sizes Battery electricity - List of battery sizes Battery electricity - History Battery electricity - Environmental considerations Battery electricity - The future
Battery electricity - People/inventors Battery electricity - Related electrical topics Battery electricity - Related electronics concepts Battery electricity - Chemicals used in construction Battery electricity - Related inventions Battery electricity - Other

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