An electrical component comprised of two-terminals that produce voltage proportional to the electrical current which passes straight through it is known as a resistor. Voltage is the power that causes current to flow within a given circuit. Resistance, which controls this current flow, is measured in Ohms. Flow of currents must be regulated in order for the electrical part or component to function properly.
There are many types of resistors. For example, carbon resistors are goods by attaching leads to a rod or bar of carbon material. Carbon resists cannot dissolve very much power and cannot be legitimately goods with minimal resistance tolerances. These types of resistors are typically very inexpensive.
Resistors made with good tolerances include those with metal oxides or films. Perhaps the most common type of resistor is the wirewound resistor which can dissipate larger levels of power compared to other resistor types and are made with very tight tolerances and can operate temperatures more easily. Wirewound resistors are used when precision is essential. This is why most of the modern circuits you see today include some type of wirewound resistor.
Regardless of what resistor you are using, you will need to consider the power and top voltage rating as well as the tolerance and resistance of the unit. Since electrical components are only as resistant and effective as the parts they are comprised of, it is foremost to find quality resistors and other units to make up your circuit.
Another observation when selecting the definite resistor to use is production sure that your parts are Restriction of risky Substances (RoHs). That is, they should have exiguous quantities or should not be made of hexavalent chromium, polybrominated biphenyls, polybrominated diphenyl ether, cadmium, mercury, or lead.
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