Charge transfer between two insulators rubbed together

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SUMMARY

The discussion centers on the charge transfer between two insulators, specifically when a glass rod is rubbed with wool. It is established that the parasitic capacitance of the human body, used in Electrostatic Discharge (ESD) testing, ranges from 100pF to 220pF. By applying the formula for charge (Q = C × V), where voltage can reach a couple of kilovolts, one can estimate the charge transferred during this interaction. This provides a practical understanding of static electricity generation through friction between insulators.

PREREQUISITES
  • Understanding of capacitance and voltage relationships
  • Familiarity with Electrostatic Discharge (ESD) testing
  • Basic knowledge of static electricity principles
  • Awareness of the Human Body Model in electrical testing
NEXT STEPS
  • Research the formula for charge calculation (Q = C × V)
  • Explore the effects of different materials on charge transfer
  • Study the Human Body Model and its application in ESD testing
  • Investigate methods to measure static electricity in practical scenarios
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Physics students, electrical engineers, and anyone interested in understanding static electricity and its practical implications in ESD scenarios.

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How much charge is actually transferred when two insulators are rubbed together?
Example: When glass rod and wool are rubbed together
 
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Arsen34 said:
How much charge is actually transferred when two insulators are rubbed together?
Example: When glass rod and wool are rubbed together
Welcome to the PF.

One ballpark number can be calculated by using the capacitance of the "Human Body Model" used for ESD testing. The parasitic capacitance of the human body is often approximated as 100pF-220pF, and you can charge yourself up to a couple kV by rubbing the materials.

Are you familiar with the equation relating the charge on a capacitor to the capacitance and voltage? :smile:
 

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