Demos: 5A-17 Static Charge Indicator

This device will determine the sign of the charge on a charged object. It works by using a transistor that is contained in the dome of the device. The transistor responds to changes in voltage of small scales (tens of volts) and can thus determine whether the object possesses a positive or negative net charge.

DIRECTIONS:

1. Leave the unit off to begin.
2. Bring a charged object within a few centimeters of the brass dome without touching the dome.
3. Turn the device on.
4. If the charged object is negative, the green LED will illuminate and then turn red when you remove the charged object.
5. If the charged object is positive, the red LED will illuminate and then turn green when you remove the charged object.

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