Resistors

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Resistors



Resistors are common elements of electrical networks and electronic circuits and are ubiquitous in electronic equipment.

An electrical network is an interconnection of electrical components e.g. batteries, resistors, inductors, capacitors, switches, transistors, etc. or a model of such an interconnection, consisting of electrical elements e.g. voltage sources, current sources Resistance, inductance, capacitance.

An electrical circuit is a network consisting of a closed loop, giving a return path for the current. Linear electrical networks are a special type consisting only of sources (voltage or current) and have the property that signals are linearly superimposable (the ability for an object to be placed over another object; without visibility restriction).

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, divide voltages, bias active elements, and terminate transmission lines. among other uses.

In other words, the resistor is a component incapable of controlling current by means of another electrical signal called a passive device, like the resistor

The components can be classified as passive, active, or electromagnetic. The strict physics definition treats passive components as ones that cannot supply energy themselves, whereas a battery would be seen as an active component since it truly acts as a source of energy. however, electronic engineers who perform circuit analysis use a more restrictive definition of passivity. When only concerned with the energy of signals, it is convenient or ignores the so its called DC circuit.
  1. Active components rely on a source of energy(usually from the DC circuit, which we have chosen to ignore) and usually can inject power into a circuit, though this is not part of the definition. Active components include amplifying components such as transistors, and triode (it was very widely used in consumer electronics such as radios, televisions, and audio system until it was replaced in 1960 by the transistors, invented in 1949, which brought the vacuum tube era introduced by the triode to a close), vacuum tubes (valves) and tunnel diodes.
  2. passive components can't introduce net energy into the circuit. They also can't rely on a source of power, except for what is available from the (AC) circuit they are connected to. As a consequence, they can't amplify(increase the power of a signal), although they may increase a voltage or current (such as is done by a transformer or resonant circuit). Passive components include two-terminal components such as resistors, capacitors, inductors, and transformers.
  3. Electromechanical components can carry out electrical operations by using moving parts or by using electrical connections.



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