An electrical circuit consists of one or more electrical components connected to a power supply. The characteristics and functionality of the circuit is determined by the nature of those components.
Electrical components are connected with wire or printed circuit board tracks having a high electrical conductivity.
The fundamental electrical quantity is charge (Q). Although not related to the mass of bodies, charge still affects the forces of attraction - or repulsion, as the case may be - between them. The SI unit of charge is the coulomb (C).
Current (I) is defined as the rate of flow of charge, and it is this flow that powers a circuit. By convention, circuit diagrams show current flowing from the positive to the negative terminal of the power supply; this convention was established before it was discovered that current involves the flow of negatively-charged electrons, which would be repelled by the negative terminal. The SI unit of current is the amp (A).
A computer may be described as an electronic device that processes information according to instructions it has been given.
Computers have both hardware and software. Hardware consists of physical components such as nuts and bolts, integrated circuits, wires and disks. Software holds the programs that run on the computer.
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