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The electric field was formally defined as the force exerted per unit charge, but the concept of potential allows for a more useful and equivalent definition: the electric field is the local gradient of the electric potential. Usually expressed in volts per metre, the vector direction of the field is the line of greatest slope of potential, and ...
The following is a list of notable unsolved problems grouped into broad areas of physics. [1]Some of the major unsolved problems in physics are theoretical, meaning that existing theories seem incapable of explaining a certain observed phenomenon or experimental result.
The leakage reactance (usually about 5 to 10% of the full load impedance) helps limit both the magnitude and rate of rise of the fault current. Short-circuiting a 3000 farad supercapacitor through an iron nail resulted in a 1000 amperes current. This caused the iron nail to melt, eject sparks, and eventually break, becoming an open circuit.
The first half of the 700-page book is a history of the study of electricity. It is parted into ten periods, starting with early experiments "prior to those of Mr. Hawkesbee", finishing with variable experiments and discoveries made after Franklin's own experiments.
Experiments involving triboelectricity and static electricity occurred before the discovery of the electron. The name ēlektron (ἤλεκτρον) is Greek for amber, [10] [11] which is connected to the recording of electrostatic charging by Thales of Miletus around 585 BCE, [12] and possibly others even earlier.
10 Hard Math Problems That Remain Unsolved Getty/Creative Commons. ... In September 2019, news broke regarding progress on this 82-year-old question, thanks to prolific mathematician Terence Tao.
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In digital electronic circuits, electric signals take on discrete values, to represent logical and numeric values. [4] These values represent the information that is being processed. In the vast majority of cases, binary encoding is used: one voltage (typically the more positive value) represents a binary '1' and another voltage (usually a ...