A custom resistor is an electric component that is designed to oppose the flow of electricity in any circuit. Resistors can be of fixed or varying values depending on the specifications of the manufacturer. Fixed valued resistors can only give a single amount of resistance, say ten units of resistance. On the other hand, varying resistors can be manipulated to give different values of resistance to the flow of electricity as the operator may deem necessary. With varying resistors, therefore, it is possible to have a circuit that can exhibit more than one value of electrical resistance.
Resistors play a very important role in circuits and therefore their use is inevitable. One of the most outstanding ways where resistors can be used is in having the Light emitting diodes and transistors to work. These devices work only at a given amount of current since too low or too high electric current renders them inoperable. Owing to this fact, these devices require that a surface mount resistor is paired with them so that just the right amount of electricity is allowed to pass through them, hence causing them to work.
Resistors are also useful for heating processes. The flow of electricity is as a result of the flow of electrons in the conductor. When these electrons are hindered in a way, it can be assumed that this hindrance creates some form of friction and this friction result in heat being generated. Now this heat being generated can be used for lighting, such as is the case with electric bulbs. The heat can also be used in heating appliances and in other processes when it is tapped aright.
Certainly, there would be no voltage dividers without the concept of resistors being used. A voltage divider is essentially a connection of resistors in series. The resistors do not have to be of the same value but can be of any values. Now, when the voltage passes through the resistors, it is literally divided such that the amount of voltage that is to be obtained from any resistor will be indirectly proportional to the amount of resistance at the circuit joint. This use is important when it is necessary to subdivide the current being conducted in a given circuit. Such a constraint to the flow of electricity is necessary for certain appliances that cannot take the full amount of electricity as is released from the mains.