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 called resistance and is measured in ohms which represented by the Greek letter omega. A resistor limits the quantity of power that gets to the other components of the system. An example would be when a bulb receives too much light the bulb will eventually be damaged. In this way a resistor is a guardian to other sections of the circuit.
Variations in systems means different levels of resistance are needed. Custom resistors are therefore built to handle this. They are designed for different systems and uses. When picking a resistor for a system one should know how much heat the resistor can endure before it is rendered useless. Resistors heat up when current passes through them.
A resistor with high resistance will be hotter than one with lower 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.
Tolerance refers to how correct a resistor is. It is hard to make a custom resistor that would be perfect for a system and the current 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 instance, a 5% resistor with a value of 200 ohms has a resistance of between 190 ohms and 210 ohms.
Materials for making custom resistors are carbon, metal or ceramic. It has to be noted that the resistors will build up heat as current flows through. The material they are made of should be able to withstand the heat without for instance catching fire or melting. Most resistors today are made of metal or carbon.
Resistors are made either surface-mount or through-hole mount termination designs. The main material for Through-hole mount are either made of carbon, metal film or very thin metal foil. The former is the cheaper option. The surface mount resistors are generally created with either thick metal foil or thin metal foil. Normally, resistors that are made from thin foil are cheaper than those made from thick 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.