First let us know what a resistor is.Therefore, a resistor is simply a device with resistance to the passage 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 Load of Resistance needed through the Resistor
This is one of the most fundamental selection 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 choosing the best resistor, first, know the amount of output current needed to be produced. This assists to know whether to select a smaller or larger resistor depending with the device being used.
The Nature of Resistive Substance
The metal film will be the best option to use with higher frequency.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 limit goes hand in hand with the quantity of energy produced. One thing that almost everyone doesn’t pay attention to is the fact that a resistor gets hot and the resistance changes. Adding on to the change in resistance, the quantity of energy produces from the resistor is definitely going to be different from the moment the resistor heats up. When the temperature is already maximum and the energy dispersed remains maximum then the end product will be a destroyed 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.
Energy assessment relates hand in hand and close to the size of the case.Physically smaller gadgets contain low working voltage ratings due to their close contacts and could easily arc over. With this, it is meant that with high systems like off-line power supplies larger sized or many resistors in series will be used. This is so as to get the voltage ratings to the whole circuit higher.