They come in different forms ranging from variable resistors to fixed resistors. Depending on the feature of resistors, both are used in many applications. I am going to cover all aspects relating to resistors.
Resistors can also be used in combination. There are classified into two types according to their combination. Resistors come in different forms, sizes, and shapes. Resistors are used in different applications depending on the current rating voltage and resistance. Resistors are mainly classified into two types:.
Resisters are widely used in many electrical circuits. Following are the main applications of resistors. I have tried my best to cover as many aspects as possible relating to resistors. Normally two types of resistor have linear properties first one is fixed resistor and second one is variable resistor, but these are further dived into different types.
Fixed Resistor: Fixed resistors are the resistor whose values are fixed mean its values could not change. Types of Fixed Resistor: Fixed resistors are divided into four types,.
Wire Wound Resistors: Wire wound resistor is a type of resistor which is made up with insulating rod or core, at which resistor wire is wrapped around this rod or core. Resistor wire is generally made up with magnetism or tungsten or nickel material and core is made up with press bound paper or ceramic clay material or beaklike etc. If we talk about the cost of wire, then magnetism wire wound resistors are so much costly and these are mainly used in sensitive test equipment such as in wheat stone bridge etc.
Their power rating which is easily available in market is 2 watts to up to watts, ohmic resistance 1ohm K ohm and these could be operated safely at C o temperature.
A simple wire wound resistor is shown in figure 2. Carbon Composition Resistors: These types of resistors are made out with the mixture of graphite or powdered carbon or resin binder or insulation filler. The ratio of insulating material in these resistors decided the value of resistor. These are made up in rod shapes and two metal caps are connected at the both ends of this rod which are easily sold in PCB.
They are very reliable, very cheap and small in size therefore they occupy less space. They are available in market in different ohms and power rating. A simple carbon composition resistor is shown in figure 3. Thin Film Resistor: Typically, thin film resistors are made up with a resistive material of high grid ceramic rod.
On this insulating rod which are normally available in market in the shape of glass or tube, a thin layer of conductive material is layer and overlaid to form a thin film resistor. This resistor is further divided into two types first one is carbon film resistor and second one is metal film resistor.
Carbon Film Resistor: Carbon film resistors consist of a high grid ceramic material rod that is called substrate, and, on this substrate, a very thin resistive layer of carbon or film is layer and overlaid to form a carbon film resistor. Because they have negligible resistance, high stability and wide operating range as compared to other types of resistors therefore they are mainly used in electronic circuits.
Metal Film Resistor: The construction of metal film resistor is almost same as carbon film resistor but the only difference between them is that its core is made up with metal material instead of carbon. They are very cheap, tiny and reliable in operation. These are used in that places where low noise and stability is not so much important. A metal film resistor is shown in figure 5. Thick Film Resistor: The manufacturing method of thick film resistor is same as metal film resistor or thin film resistor, but the difference is only that it has made up with thick layer of resistive material instead of thin layer.
Therefore, it is called thick film resistor. Variable Resistor: Variable resistors are the resistor whose values changed by moving the knob. These are further divide into three types. Potentiometers: It is the type of resistor whose resistance value is changed by rotating the wiper which is connected to control shaft.
It consists of three terminals, resistance between external terminal is fixed and resistance between one external and one central terminal is variable. These are used for controlling the voltages of electronic circuit.
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