A resistor is a specialized electrical component that provides resistance as a circuit element. Resistors are passive, which means they are not affected by the current they carry.Know More
Resistors have two primary functions within a circuit:
Resistors are usually made of metal or carbon wire. They are designed to keep a constant value when in use and produce heat instead of light when used inside an electrical component. As the circuit works, resistors dissipate heat, which is not used. On the other hand, the metal portion of a light bulb is a type of resistor that does emit light.
There are three types of resistors:
Fixed resistors are the most common. They can be found inside many different types of electronic components and serve to protect them from too much current flow.
Traditional variable resistors are continually altered as they work. A common type of variable resistor is found in the volume control on a radio. Another type of variable resistor is called a potentiometer, or a pot. Pots are usually small and work by having their resistance control adjusted once and fixed, often with a screwdriver.
Two common types of special resistors include light-dependent resistors, which change resistance as light levels change. Similarly, thermistors change resistance as the temperature changes.Learn more about Electrical
Wiring a capacitor to start a motor begins with the connection of the positive terminal of the motor to the resistor. Take one terminal of the resistor, and connect it to the capacitor. Read the wiring diagram on your appliance to understand the colors that the manufacturer designed for the three connections, namely, start, run and common. Locate the negative terminal of the capacitor, and attach it to a switch.Full Answer >
The RC time constant is the product of the resistance and capacitance of a circuit, or R x C. It is used to describe the rate of charging when a battery is connected to a resistor and capacitor in series. RC circuits can effectively function as timers.Full Answer >
A transistor works by changing its resistance between the amount of power going in and the power going out, depending on how much current flows through the base to the emitter. Transistors can amplify electronic signals and precisely control the amount of current going through the circuit.Full Answer >
A rheostat is a variable resistor that is used to alter the amount of voltage or current in a circuit, according to HowStuffWorks. Rheostats make possible functions of electronics such as light dimmers and volume dials.Full Answer >