Tips to Follow When Identifying the Right Resistor
First let us know what a resistor is. So, a resistor is a device that regulates the flow of current. Almost any electrical gadget has 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
This one of the many most fundamental criteria factors for a resistor. Apart from resistance being one of the important factors, different factors like the range of temperature, circuit voltage requirements, noise and thermal considerations will also influence the choice of a resistor. In choosing the best resistor, first, know the amount of output current needed to be produced. This helps in identifying the size of the resistor to be used with the device.
The Nature of Resistive Substance
With a higher accuracy, choosing a metal film will be the best option. This is due to the less than one percent tolerance that the thin film possesses. 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.Even with more accuracy and having a tighter tolerance, metal film resistors have less noise and are more immune to radio frequency. So since they are more desirable you can get one of lower radio frequency.
The Temperature level
The temperature range goes parallel with the amount of power dispersed.But one thing that most people overlook is the fact that as a resistor heats up when 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 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 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.This is in order to get voltage rating of the entire circuit higher.