Tips to Follow When Identifying the Right Resistor
First let us know what a resistor is. Thus, a resistor is just a gadget with resistance to the passing of current. Almost any electrical gadget has a resistor for it to work. Thus, choosing the right resistor is very crucial.Here are some of the factors to consider when selecting the best resistor.
The Amount of Resistance to go 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 in identifying the size of the resistor to be used with the device.
The Type of Resistive Material
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.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.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. Something else that people don’t put into consideration is the fact that a resistor heats up and the resistor 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. 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.
Voltage rating relates directly and intimately 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 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.