Resistors are the basic components in the circuit. After testing the conductivity of various materials and discovering the existence of electric current, early scientists gradually came up with the concept of resistance. Scientists have found that copper, gold, and aluminum are good conductors with low resistance, while air, mica, and ceramics are considered resistors because they can greatly limit the flow of current. Although people in the industry have long known its resistance performance, the reliable resistors we know today have never been born. It was not until Otis Boykin created the first cheap and reliable resistor in 1961 that scientists were able to precisely control it. The amount of current transmitted to a component. With his breakthroughs, the resistors are greatly reduced from extreme temperatures and oscillations, making it possible for low-cost production. As the US military, IBM, and many consumer electronics manufacturers have placed orders for Boykin's new resistors, they are everywhere from household appliances and computers to guided missiles.
Resistors are ubiquitous in today's electronic products. As passive devices, they only consume but never provide energy. They have a wide range of uses in circuits, for example, to adjust the current input to the LED, or to control the total voltage conducted to active devices such as transistors. The resistor can be used to block the transmission line and prevent reflections, or it can be used as a pull-up or pull-down resistor in the GPIO of the microcontroller to enhance the stability of the system. The combination of resistors and capacitors can create the timing source necessary for flashing lights or electronic alarm circuits. A "daisy chain" of resistors in series can be used as a voltage divider, which is useful for components that need to operate at a voltage lower than the input voltage.
