Electricity (from , 'amber') is a general term for the variety of phenomena resulting from the presence and flow of electric charge. Together with magnetism, it constitutes the fundamental interaction known as electromagnetism. It includes many well-known physical phenomena such as lightning, electromagnetic fields and electric currents, and is put to use in industrial applications such as electronics and electric power. In casual usage, the term electricity is applied to several related concepts that are better identified by more precise terms: Electric potential - the capacity of an electric field to do work, typically measured in volts. Electric current - a movement or flow of electrically charged particles, typically measured in amperes. Electric field - an effect produced by an electric charge that exerts a force on charged objects in its vicinity. Electrical energy - the energy made available by the flow of electric charge through an electrical conductor. Electric power - the rate at which electric energy is converted to or from another energy form, such as light, heat, or mechanical energy. Electric charge - a connection conserved property of some subatomic particles, which determines their electromagnetic interactions. Electrically charged matter is influenced by, and produces, electromagnetic fields. Contents 1 History of electricity 2 Concepts in detail 2.1 Electric potential 2.2 Electric Current 2.3 Electric field 2.4 Electrical energy 2.5 Electric power 2.6 Electric charge
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A day (symbol: d) is a unit of time equivalent to 24 hours. It is not an SI unit but it is accepted for use with SI. The SI unit of time is the second. The term comes from the Old English dg, with similar terms common in all other Indo-European languages, such as dies in Latin and dive in Sanskrit. Contents 1 Definitions 1.1 International System of Units (SI) 1.2 Astronomy 1.3 Colloquial 2 Introduction 3 Civil day 4 Leap seconds 5 Astronomy 6 Boundaries of the day 7 Metaphorical days 8 References
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