Van de graff generators maximum voltage

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SUMMARY

Van de Graaff generators have a maximum voltage due to the limitations imposed by the electric field strength at which corona discharges occur. The maximum achievable potential is approximately equal to the sphere's radius multiplied by the electric field strength, which is around 30 kV/cm in air at standard temperature and pressure (STP). For instance, a polished spherical electrode with a diameter of 30 cm can reach a maximum voltage of about 450 kV. Understanding these principles is crucial for effectively utilizing Van de Graaff generators in practical applications.

PREREQUISITES
  • Understanding of electric fields and potential difference
  • Knowledge of corona discharge phenomena
  • Familiarity with the principles of Van de Graaff generators
  • Basic concepts of standard temperature and pressure (STP)
NEXT STEPS
  • Research the principles of electric field strength and breakdown voltage
  • Explore the design and operation of Van de Graaff generators
  • Learn about corona discharge and its implications in high-voltage systems
  • Investigate the effects of atmospheric conditions on electrical discharges
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Physics students, electrical engineers, and hobbyists interested in high-voltage experiments and the operation of Van de Graaff generators.

abdo799
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Why do van de graff generators have a maximum voltage( charge on the sphere ) .
Why can't they just accumulate charge on the sphere as large as we desire?
 
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Hi abdo799! I am surprised to find you asking such a question here! What have you done to find the answer so far? No member here on Physics Forums wants to "spoon feed" any questioner.

Here on Physics Forums your question has been asked several times recently. The empty white rectangular box at the upper right of this page with the little magnifying glass symbol on the right allows one to enter key search words to find relevant posts.

https://www.physicsforums.com/showthread.php?t=468730
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I used Google to search and found many clear answers for you in approximately two minutes seventeen seconds. Please learn to use Google, it's your friend. Once you get the basics, if you have doubts or need some explanations, then return here and post your questions.

"The maximum achievable potential is approximately equal to the sphere's radius multiplied by the e-field where corona discharges begin to form within the surrounding gas. For example, a polished spherical electrode 30 cm in diameter immersed in air at STP (which has a breakdown voltage of about 30 kV/cm) could be expected to develop a maximum voltage of about 450 kV."
http://en.wikipedia.org/wiki/Van_de_Graaff_generator
 
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