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.Nearly any electrical device will need a resistor for it to work. Thus, choosing the right resistor is very crucial. Below are some factors to look into before selecting the best resistor.
The Quantity of Resistance Required through the Resistor
This is one of the most fundamental selection factors for a resistor. Not only resistance is an important factor but other factors such as range of temperature, circuit voltage requirements, noise and thermal considerations can also interfere with the choice of a resistor. To select the right resistor, first put in mind the amount of output current dissipated.This helps to know whether to pick a smaller resistor or a bigger one depending on what is expected of the device.
The Kind of Resistive Material
With a higher accuracy, choosing a metal film will be the best option.This is because the thin films have less than one percent tolerance. Through the sputtering process film vapor is put onto a substrate surface to a precise 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.Therefore, they are more desirable in case you need a lower radio frequency.
The Temperature Range
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. With the addition to this change in resistance, the level of energy dispersed from the resistor will most probably change 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. Therefore, when the operating conditions are below the maximum then it will be fine.But when the ambient temperature will be raised then there will be a need to factor in the de-rating and choose the right temperature ratings and power 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 means that with high systems like off-line power supplies there will be a need to use larger sized or maybe even more than one resistor in series. The reason for this is to ensure that the voltage of the entire circuit is higher.