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Electricity is the set of physical phenomena associated with the presence and motion of matter possessing an electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwell's equations.
The current entering any junction is equal to the current leaving that junction. i 2 + i 3 = i 1 + i 4. This law, also called Kirchhoff's first law, or Kirchhoff's junction rule, states that, for any node (junction) in an electrical circuit, the sum of currents flowing into that node is equal to the sum of currents flowing out of that node; or equivalently:
Use of diagrammatic representations of circuit diagrams can aid understanding of principles of electricity. Principles of the physics of circuit diagrams are often taught with the use of analogies, such as comparing functioning of circuits to other closed systems such as water heating systems with pumps being the equivalent to batteries.
Conversion between electricity and light is limited. Photovoltaic cells achieve a maximum of 40%–50% efficiency. [132] Atmospheric absorption, and absorption and scattering by clouds, fog, rain, etc., causes up to 100% losses. Requires a direct line of sight with the target.
Electric power is the rate of transfer of electrical energy within a circuit.Its SI unit is the watt, the general unit of power, defined as one joule per second.Standard prefixes apply to watts as with other SI units: thousands, millions and billions of watts are called kilowatts, megawatts and gigawatts respectively.
Six men have been jailed after a man was killed during a burglary in North Lincolnshire. Ian Staves, 44, was found dead at his home in Cherry Lane, Wootton, on 12 September 2022.
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