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Charging a capacitor from a constant voltage source dissipates in the circuit resistance

  • A.an amount depending on the value of the resistance
  • B.as much energy as ends up stored in the capacitor
  • C.no energy at all
  • D.twice as much energy as ends up stored in the capacitor

Answer: B

The source delivers \( QV \) while the capacitor retains \( \tfrac{1}{2}QV \), so exactly half is lost whatever the resistance. Reducing the resistance makes the loss happen faster but does not reduce it, which is a result worth knowing.

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