To start off there is a need to 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. So it is important for one to know what resistor to choose.Here are some of the factors to consider when selecting the best resistor.
The Amount of Resistance to go through the Resistor
This one of the many most fundamental criteria 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 in identifying the size of the resistor to be used with the device.
The Type of Resistive Material
For a higher accuracy, the best option would be the metal film.This is because the thin films have less than one percent tolerance.Through a sputtering process, film vapor is deposited onto a substrate surface to a certain 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 level
The temperature range goes directly with the amount of power produced.But one thing that most people overlook is the fact that as a resistor heats up when 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 high and the power produced remains high then the result will be a damaged resistor. Therefore, when the operating conditions are below the maximum then it will be fine. 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 gadgets contain low 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.