Any electronic or electronic circuit has resistors as significant aspects. Resistors do not do much to clearly be identified within the circuit. As named they limit the flow of current inside a circuit. This is referred to as resistance and is gauged using Ohms denoted by the Greek letter 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.
Varying systems require varying levels of resistance. A custom resistor is one made for a particular complex. It is created to cater to the needs of that particular system. Before purchasing a resistor, it is necessary for you understand the amount of heat the resistor can endure before wearing out. Resistors are bound to heat up when current passes through them.
Resistors that are built for high resistance will be hotter than the ones with low resistance. The material used to make the resistor is important as some materials may not be able certain temperatures. When making a custom resistor you should have in mind how much heat is likely to be produced while the resistor is functioning.
The accuracy of a particular resistor is known as tolerance. It is hard to make a custom resistor that would be perfect for a system and the current flowing through it. Tolerance is gauged by plus or minus a certain percentage. A good example would be a 5 % resistor that has a value of 200 ohms will exhibit a resistance of between 210 ohms and 190 ohms.
Custom resistors can be made of carbon, ceramics or metal. It has to be noted that the resistors will build up heat as current flows through. The substance used to make them should endure the high temperature and not combust or melt. Modern day resistors are made of metal or carbon.
Custom resistors can come in either hole-mount or surface mount. Hole mount types are normally made from metal or carbon films but they can sometimes be made from a thin metal foil. The former is usually cheaper than the latter. 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. This is because they can be easily regulated between a wide range of values. These are called rheostats and are common in components such volume knobs.