Factors to Consider When Selecting the Best Resistor
To begin with, knowing what a resistor is important. So, a resistor is a device that regulates the flow of current. Most electrical appliances need a resistor for them 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 Load of Resistance needed through the Resistor
The amount of resistance is one of the important 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 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.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 Limits
The temperature range goes parallel with the amount of power dispersed. Something else that people don’t put into consideration is the fact that a resistor heats up and the resistor 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. Thus, it will be fine when the operating conditions are beneath the maximum.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.
Energy assessment relates hand in hand and close to the size of the case. Physically small-scale appliances possess less working voltage ratings due to their adjacent contacts and could easily bend 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.