Static electricity can be produced by friction between two surfaces that are in close contact. The basic Law of Electrostatics states that opposite charges attract and like charges repel. The purpose of an electric current is to transfer energy. Ohm's Law describes the current flow. The current may be increased by increasing the voltage or by decreasing the resistance.
Electric power is found by multiplying voltage by the current.
Series and Parallel Circuits Series circuits are those in which all the current travels through each electrical device. A parallel circuit is set up to allow the current to split and travel to several devices at once. A complex circuit is a combination of series and parallel circuits. Electromagnetic Induction Electromagnetic induction is the process of generating a current by the relative motion between a wire and a magnetic field. A generator consist of a number of wires placed in a magnetic field.