Any electronic or electronic circuit has resistors as significant aspects. They do not do anything that would stand out within the circuit though. Resistors as the name suggests resist the flow of current within a circuit. The result of the resistors functioning is referred to as resistance which is measured in Ohms and represented by the sign omega. Resistor controls the mount of current that reaches the other parts of the circuit. If for instance there is too much current going to a light bulb it will be damaged. From this functionality it is clear that the resistor protects other parts of the circuit.
Different systems require different levels of resistance. Custom resistors are therefore built to handle this. It is created to cater to the needs of that particular system. When picking a resistor for a system one should know how much heat the resistor can endure before it is rendered useless. Resistors become warmer when current passes through them.
Resistors that are built for high resistance will be hotter than the ones with low resistance. The material the resistor is made of may not be capable of handling certain temperatures and therefore it will be damaged at those temperatures. When making a custom resistor you should have in mind how much heat is likely to be produced while the resistor is functioning.
Tolerance refers to the accuracy of a particular resistor. It is impossible to make a resistor that is a hundred percent correct for a complex and the power flowing through it. The measure of tolerance or accuracy of a resistor will be designated as a plus or minus of a specific percentage. For example a 5% resistor with a rating of 200ohms has a limit ranging 190ohms and 210ohms.
The main materials used to make custom resistors are carbon, ceramics and metals. As shown above resisters heat up as power flows in them. The material they are made of should be able to withstand the heat without for instance catching fire or melting. Modern day resistors are made of metal or carbon.
Custom resistors can come in either hole-mount or surface mount. Through-hole mount are either made of carbon or metal film or very thin metal foil. The former is the cheaper option. The Surface mount resisters are made of either thin or thick metal foil. It should be noted that resistors made of thin foil are low-cost as compared to those made of thin foil. Variable resistors are good option to the static resistors. The resistors can also be regulated to operate within a range of values. They are also called rheostats and are often used in such components as knobs for volume.