Plastic Casing Student Electroscope with accessories

The electroscope is an early scientific instrument used to detect the presence of electric charge on a body. It detects charge by the movement of a test object due to the Coulomb electrostatic force on it. The amount of charge on an object is proportional to its voltage. The accumulation of enough charge to detect with an electroscope requires hundreds or thousands of volts, so electroscopes are used with high voltage sources such as static electricity and electrostatic machines. An electroscope can only give a rough indication of the quantity of charge; an instrument that measures electric charge quantitatively is called an electrometer or Columemeter.

驗電器是一種早期的科學儀器，用於檢測物體上是否存在電荷。 它透過測試對象由於其上的庫侖靜電力而移動來檢測電荷。 物體上的電荷量與其電壓成正比。 累積足夠的電荷以用驗電器檢測需要數百或數千伏特的電壓，因此驗電器與高壓源（例如靜電和靜電電機）一起使用。 驗電器只能粗略地指示電荷量； 定量測量電荷的儀器稱為靜電計或電量計。