The idea of the electric field was presented by Michael Faraday. An electric field is created by a charged body in the space that encompasses it, and results in a force applied on any other charges placed inside the field. 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, stretches out towards ungainliness and demonstrates a reverse square relationship with distance. These terms allude to how the current varies in time. Direct current, as created by example from a battery and required by most electronic devices, is a unidirectional stream from the positive part of a circuit to the negative. If, as is most normal, this stream is carried by electrons, they will travel the other way.
Alternating current is any current that switches course repeatedly; almost always this takes the form of a sine wave. Alternating current consequently heartbeats back and forth inside a conductor without the charge moving any net distance after some time. The time-averaged value of an alternating current is zero, however it conveys vitality initial one way, and then the switch. However, there is an important contrast. Gravity always acts in attraction, drawing two masses together, while the electric field can result in either attraction or repugnance. Since large bodies, for example, planets generally carry no net charge, the electric field at a distance is usually zero. Along these lines gravity is the dominant force at distance known to man, regardless of being much weaker.