Charge is possessed not just by matter , but also by antimatter , each antiparticle bearing an equal and opposite charge to its corresponding particle. Thus gravity is the dominant force at distance in the universe, despite being much weaker. The principles of electrostatics are important when designing items of high-voltage equipment. This principle is exploited in the lightning conductor , the sharp spike of which acts to encourage the lightning stroke to develop there, rather than to the building it serves to protect : Electric circuit A basic electric circuit. For practical purposes, it is useful to define a common reference point to which potentials may be expressed and compared. These terms refer to how the current varies in time. Exploitation of this discovery enabled him to invent the first electrical generator in , in which he converted the mechanical energy of a rotating copper disc to electrical energy. The positive-to-negative convention is widely used to simplify this situation.
Gravity always acts in attraction, drawing two masses together, while the electric field can result in either attraction or repulsion. A capacitor will therefore not permit a steady state current, but instead blocks it. Electric power, like mechanical power , is the rate of doing work , measured in watts , and represented by the letter P. Current can consist of any moving charged particles; most commonly these are electrons, but any charge in motion constitutes a current. Installed capacity by source in India as on 31 August  Coal: An electric arc provides an energetic demonstration of electric current The process by which electric current passes through a material is termed electrical conduction , and its nature varies with that of the charged particles and the material through which they are travelling. The time-averaged value of an alternating current is zero, but it delivers energy in first one direction, and then the reverse. Earth is assumed to be an infinite source of equal amounts of positive and negative charge, and is therefore electrically uncharged—and unchargeable. These regional links were established to enable transmission of surplus electricity between States in each region. A current was allowed through a wire suspended from a pivot above the magnet and dipped into the mercury. The inductor's behaviour is in some regards converse to that of the capacitor: A small charge placed within an electric field experiences a force, and to have brought that charge to that point against the force requires work. Voltage and Battery electricity A pair of AA cells. A capacitor connected to a voltage supply initially causes a current as it accumulates charge; this current will however decay in time as the capacitor fills, eventually falling to zero. The control of the company was transferred from London to Calcutta only in An electric field has the special property that it is conservative , which means that the path taken by the test charge is irrelevant: Electric field See also: Faraday's homopolar motor consisted of a permanent magnet sitting in a pool of mercury. They must also lie parallel to a conductor 's surface, otherwise this would produce a force that will move the charge carriers to even the potential of the surface. Moreover, the interaction seemed different from gravitational and electrostatic forces, the two forces of nature then known. The electric field acts between two charges in a similar manner to the way that the gravitational field acts between two masses , and like it, extends towards infinity and shows an inverse square relationship with distance. The level of electromagnetic emissions generated by electric arcing is high enough to produce electromagnetic interference , which can be detrimental to the workings of adjacent equipment. As the electric field is defined in terms of force , and force is a vector , so it follows that an electric field is also a vector, having both magnitude and direction. Their work was greatly expanded upon by Michael Faraday in 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 links were subsequently upgraded to high capacity synchronous links.
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