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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 most common description of the electromagnetic field uses two three-dimensional vector fields called the electric field and the magnetic field.These vector fields each have a value defined at every point of space and time and are thus often regarded as functions of the space and time coordinates.
The Key Stage 1, 2 and 3 along with GCSE section covers a range of subjects. In Key Stage 1, 17 subjects are available, including Art and Design, Computing, Design and Technology, English, Geography, History, Maths, Music, Physical Education, PSHE, Citizenship, Religious Education, Science, and Modern Foreign Languages. [5]
[32] [33] Franklin imagined electricity as being a type of invisible fluid present in all matter and coined the term charge itself (as well as battery and some others [34]); for example, he believed that it was the glass in a Leyden jar that held the accumulated charge. He posited that rubbing insulating surfaces together caused this fluid to ...
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.
Ohm's law states that the electric current through a conductor between two points is directly proportional to the voltage across the two points. Introducing the constant of proportionality, the resistance, [1] one arrives at the three mathematical equations used to describe this relationship: [2]
For children in the age range 10−13, batteries are used to illustrate the connection between chemistry and electricity as well as to deepen the circuit concept for electricity. The fact that different chemical elements such as copper and zinc are used can be placed in the larger context that the elements do not disappear or break down when ...
The velocity of electromagnetic waves in a low-loss dielectric is given by [1]: 346 = =.. where = speed of light in vacuum. = the permeability of free space = 4π x 10 −7 H/m.
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