To begin with, knowing what a resistor is important. So, a resistor is a device that regulates the flow of current.Nearly any electrical device will need a resistor for it to work.Therefore, there is a need for one to know the right resistor to acquire. Listed below are just but a few factors to put in mind before choosing the best resistor.
The Amount of Resistance to go through the Resistor
The amount of resistance is one of the important criteria factors for a resistor.In as much as resistance is one of the fundamental factors there is, other factors such as the range of temperature, circuit voltage requirements, noise and thermal considerations that will also influence the choice of the resistor.In selecting the right resistor, first, consider the amount of output current being produced. This assists to know whether to select a smaller or larger resistor depending with the device being used.
The Nature of Resistive Substance
For a higher accuracy, the best option would be the metal film.This is because the thin films have less than one percent tolerance. By the process of sputtering, film vapor is deposited onto a substrate surface to the required thickness. From there the resistor is laser trimmed more. Metal film resistor have less noise and more immune to radio frequency even with even with the higher accuracy and tighter tolerance. So since they are more desirable you can get one of lower radio frequency.
The Temperature Limits
The temperature range goes directly with the amount of power produced. One thing that almost everyone doesn’t pay attention to is the fact that a resistor gets hot and the resistance changes.In addition to this change in resistance, the amount of power dispersed from the resistor is definitely going to change the moment the resistor gets heated up.When the temperature is already high and the power produced remains high then the result will be a damaged resistor. So when the operating environment is below the maximum then it will be okay. But when the circulating temperature will be increased then there will be a need to put in the de-rating and select the correct temperature ratings and energy resistor.
Voltage valuation relates parallel and intimately to the capacity of the case. Physically smaller devices have less working voltage ratings due to their close contacts and could easily arc over. This is concluded that with a high system like off-line power supplies there it will be of importance to use bigger or more than one resistor in series. The reason for this is to ensure that the voltage of the entire circuit is higher.