company news about Why does the fuse have a high resistivity?

The fuse is made of a lead-antimony alloy wire with a relatively low melting point and a resistivity, which is called a fuse. The comparison of voltage and constant resistance is more able to detect micro-current beyond the working range. Resistors need a higher current to fuse and burn electrical appliances without blowing. These principles use the thermal effect of current. The fuse controls the current flow and allows the current flow. According to the formula Q=IRT, the resistance produces more heat and is easier to fuse. It plays a protective role for safety. It has a certain relationship with Joule's law, but things in life are not so simple. The fuse can neither be large nor large It can't be small, too big will easily burn the wires in the family and even cause a fire, and too small will easily fuse and cause unnecessary troubles.

The fuse can directly look at the wire, the reason is simple, the rated current inside the fuse is the same as the wire, even if it can be regarded as a wire, the cross-sectional area of the wire is more conductive, the current is higher, the fuse is the same gauge, the resistance is 0.023 ohms, and the cross-sectional area of the wire is the same as the current and voltage. The temperature is higher than that of the wire, the same cross-sectional area, the same voltage, the current, the voltage of the fuse, and the current lower than the wire. Ignore the voltage and the current is only 2.3% of the limit current of the fuse. The 20mA fuse is similar to the wire analogy. The fuse is connected in parallel with the bulb: the current is lower than the rated current of the fuse.