What is a resistor?
The resistor is part of a circuit that resists the power flow. It has two terminals through which electricity must pass and is designed to fall the current voltage when it flows from one terminal to another. Resistors are primarily used to create and maintain known safe currents in electrical components.
The resistance is measured in the ohm's ohm. This Act states that electrical resistance is equal to voltage drops across the terminals of the resistor divided by the use of current. The high OHM rating indicates high current resistance. This evaluation can be written in several different ways - for example, 81R represents 81 ohms, while 81K represents 81,000 ohms.
The amount of resistance offered by the resistor is determined by its physical construction. The carbon composition resistor has a resistant carbon wrapped in a ceramic cylinder, while the carbon film resistor consists of a similar ceramic tube, but Hjako a conductive carbon film wrapped around the outside. Metal or metal oxiThe resistors are made in almost the same way, but with the metal instead of carbon. The wire resistor, made of metal wire wrapped around clay, plastic or glass fibers, offers resistance at higher levels of power. Used for applications that must withstand high temperatures are usually made of materials such as Cermet, ceramic metal composite or tantalum, rare metal to endure heat.
resistors are covered with paint or enamel or covered with plastic formed to protect them. Because they are often too small to be written, a standardized color coding system is used to identify them. The first three colors represent the value of OHM and the fourth denotes tolerance or how close the percentage is the resistance to the value of OHM. This is important for two reasons: the nature of its structure inaccurate and if it is used above the maximum current, the value may change or the unit itselfcan burn.
Each resistor falls into one of two categories: fixed or variable. The solid resistor has a predetermined amount of current resistance, while the variable can be adjusted to provide different levels of resistance. Variable resistors are also called potentiometers and are commonly used as a volume control on audio devices. Rheostat is a variable resistor made specifically for use with high currents. There are also metal oxide varistors that change their resistance in response to voltage increase; thermistors that either increase or lower resistance when the temperature rises or decreases; and resistant to light sensitive.