Resistors are an important aspect of any electronic or electrical circuit. Resistors do not do much to clearly be identified within the circuit. Resistors as the name suggests resist the flow of current within 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. An example would be when a bulb receives too much light the bulb will eventually be damaged. From this functionality it is clear that the resistor protects other parts of the circuit.
Varying systems require varying levels of resistance. Custom resistors are therefore built to handle this. They are designed for different systems and uses. Before purchasing a resistor, it is necessary for you understand the amount of heat the resistor can endure before wearing out. Resistors heat up when current passes through them.
Resistors that are built for high resistance will be hotter than the ones with low resistance. The substance a resistor is made of may not be able to withstand some levels of heat and will be damaged. 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 how correct a resistor is. It is impossible to make a resistor that is a hundred percent correct for a complex and the power flowing through it. The tolerance or accuracy of a resistor is given in terms of plus or minus a specific percentage. For instance, a 5% resistor with a value of 200 ohms has a resistance of between 190 ohms and 210 ohms.
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 you select should be able to withstand the heat without the risk of melting or catching fire. 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 much cheaper. The surface mount resistors are generally created with either thick metal foil or thin metal foil. Thick foil resistors are cheaper than thin foil resistors. Variable resistors are good option to the static resistors. They can be regulated to work between a range of values. These resistors are also known as rheostats and can often be found in components such as volume knobs.