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Factors Governing the Choice Of Custom Resistors

Resistors are important components of electrical circuits. Without the incorporation of resistors, circuits would not be complete and able to convey a current. In order to prevent the damage of other components in a circuit by excess current, a resistor is used to provide resistance to the current.

There are two types of resistors; namely fixed resistors whose resistance doesn’t change, and variable ones whose resistance changes depending on other components of the circuit. Because of the inability of the two types of resistors to work on the advanced circuitry present today, there was need for custom resistors to play this role. Custom resistors are produced to work on custom-made devices. They are also called precision resistors by virtue of their precision and high degree of accuracy in their operation. There are some factors that have to be considered when choosing custom resistors. A few of these factors are described here.

Amount of resistance needed in the circuit. You will have to know the measure of the total resistance in an electrical circuit before selecting a suitable resistor. The total resistance will be the value of the custom resistor to use in the circuit. For you to measure resistance, you need an instrument called an ohmmeter which gives values in Ohms. Selection of a custom resistor to fit into the circuit can only be known after measuring the resistance.

Power rating on the resistor is the other factor to consider. This has to do with the amount of power in Watts that is to be dissipated by the resistor. Power in an electrical circuit depends on the current, resistance and voltage. When the value of the square of voltage is divided by the resistance in the circuit, the result obtained is the power. So, once the two values of voltage and resistance are known, power rating for the resistor is calculated, and this information is used when choosing the custom resistor to fit the circuit.

Resistor construction is another factor to consider. This has to do with the material from which the actual resistor is constructed. There are different kinds of material used in the construction of custom resistors. Some of them are thick and thin films, metal films, foils and carbon composition. The material used in making a resistor will dictate how it will resist the current in the circuit.

How the resistor is mounted in the circuit. This factor also has great bearing on how a custom resistor will work. The various ways in which you can mount a custom resistor in the circuit include bracket mounting, panel mounting, PC as well as surface mounting. The kind of device into which the resistor is to be placed is what determines the kind of mounting to be used. You have to ensure that you get the proper resistor to fit the mounting technique on your circuit.

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