The difference between resistance fuse and chip resistor
In the circuit, when the current is abnormal, it will play the role of a fuse, protecting the safety of machinery and equipment by fusing itself.
There are three differences between SMD resistors and resistance fuses: different definitions, different usages, and different basic principles.
Resistors are generally called chip resistors, which are current-limiting components. After the resistor is connected to the circuit, the resistance of the resistor is generally fixed with two pins to limit the current through the branch connected to it.
In electrical engineering, a fuse is called a current fuse, and the IEC127 standard defines it as a \"fuse link", which mainly plays a protective role in the circuit.
The ideal resistor is linear, that is, the instantaneous current passing through the resistor is proportional to the applied instantaneous voltage. It is a variable resistor used for voltage division; when the circuit fuse is installed correctly, the fuse will be abnormal when the current reaches a certain height and heat. Cut off the current to protect the safe operation of the circuit.
The principle is different
General resistors are composed of three parts: resistor body, bone self-frame and terminal, and the resistance value is only zd resistor body; the fuse used in power circuit and high-power equipment, in addition to the three parts of general fuse, there are In the arc device, when the melt is blown, the voltage at both ends will be very high.
The role of the fuse in the circuit, like a loyal guard, guarantees the safe operation of the circuit, but when the fuse is damaged, it will lose its protective effect. Here is a way to judge whether the fuse is good or bad, and use the resistance file of the multimeter. , Easily detect whether the fuse is good or bad.