A resistor has two components of electronic terminal that produces a voltage across its terminals is proportional to the electric current through it, according to Ohm’s law:
V = IR
Resistances are components of electrical and electronic circuits and are found in most electronic equipment. Resistors practices may be of different compounds and movies, and cable resistance (son of an alloy with high resistivity, such as nickel / chromium).
The main characteristics of the resistance are the resistance, tolerance, maximum working voltage and power. Other features include a high temperature, noise and inductance. Less known is the critical resistance, the value below the power dissipation limits the maximum speed allowed on the course, and above which applies the voltage limit. Critical resistance depends on the materials from which the resistance and its physical dimensions, is determined by the design.
The resistors can be integrated into hybrid and printed circuits and integrated circuits. The size and position of the child (or terminals) are relevant to designers of equipment, resistance must be physically large enough not to overheat when dissipating their power.