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When you keep charging a capacitor for a period of time, the plates will end up being full of charges and When you keep charging a capacitor for a period of time, the plates will end up full of charges

Which one is the best expression, or both of them are wrong sentences? Thank you very much for your suggestions. I learn from the dictionary that end up can be used as end up + adj. and end up + adv./prep and end up doing something.

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Both are equally correct, but charge is uncountable in this usage:

  • ... the plates will end up being full of charge
  • ... the plates will end up full of charge

Charge can countable if you are speaking of individual electrons or ions, but is more normally uncountable as you are usually speaking of the overall effect.

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