我想知道電阻器(resistors) 和變阻器 (rheostat) 的分別and 用途??

Resistors is a device that can help to change the resistance of an object ,that can change the current flow .Resistors are divided into the categories ,one is Fixed resistors and the other is variable resistors..the former one has a fixed resistance while the latter one can change the resistance in various resistance ..rheostat is an example of variable resistors .It is coiled with wire and contain a slider that can change the length of the circuit .since the resistance is mainly depends on the thickness and the length of the wire ..a slider can control the resistance of an object .rheostat can both act as a fixed resistors and variable resistors..

因為無書係手.寫得唔係咁好同埋無咩條理...唔好意思^^

電阻器係用黎固定住電壓,以免電壓太高
而變阻器可改變電壓高低,多用作音量調節器等(總之係可調節既野都會用到,光暗都可以用,愈光/愈大聲,電阻就愈低)

電阻器(resistors) 之阻值是固定的，在底板上最多之零件，可用於產生時脈及穩定電壓。
變阻器 (rheostat)之阻值是可變動的，通常用於改變音量、調頻及調整電壓。

電阻器(resistors) 和變阻器 (rheostat)
用途:the same
They are used to lower the current of a circuit
分別:Resistor has a regular resistance.The current is unchanged.
Rheostat can used to change the currentof the circuit.