Electricity plays such a vital role in ensuring that the world is livable. It would be virtually impossible to live this earth without for instance having all the benefits of electricity such as heating, lighting, powering of industrial processes among many others. Electricity flows in a circuit through conductors. From time to time, it may be necessary to impair this flow of electricity to achieve certain goals. Impairing of the electricity flow requires the use of certain components called precision resistors. So why do you need these resistors?
First of all, custom resistors can be used to control the outputs of electrical circuits. In practice, we have two types of resistors, the fixed and the variable valued resistors. The variable resistors can have their values changed to achieve varying results. By changing the value of the resistance in a circuit, the outputs of a circuit may be manipulated to give higher or lower outputs. A practical example for this is when resistors are used to influence the loudness of a sound amplifier.
Secondly, custom resistors can be used for heating purposes. The process of electric resistance usually generates a lot of heat. Resistance can thus be seen as a means to convert electric energy into heat. The heat generated is crucial for lighting- where electric bulbs use a high amount of resistance to turn the filaments white hot to give light. The heat can also be used in heaters, heating devices among many others.
Thirdly, resistors are also used to form what is called voltage division in a circuit. A voltage divider is usually created by connected a chain of custom resistors to form a series. Now, it will be found out that if the resistors used for this end in a single circuit have the same resistance value, the amount of voltage dropped for each of them is equal. When the values vary, the voltage dropped per resistor will also vary. In this case, different values of voltages are obtained for the same circuit despite the fact that the source voltage is higher than each voltage amount dropped per resistor.
Finally, resistors are useful in having the Light Emitting Diodes, LEDs and transistors to work. These components usually are affected by too much electric current. They are also known not to work in cases where too low amounts of electric current are passed through them. As a result of this, the right resistance is needed to have them work.