Discussion
The ripple current rating of a dc link capacitor matters because
Answer: A
Correct answer: ripple current heats the capacitor internally
The capacitor has an equivalent series resistance, and the ripple current flowing through it dissipates \( I^2R \) inside the can. That heat raises the internal temperature, which accelerates the loss of electrolyte and shortens the life - so the ripple rating is a thermal limit rather than an electrical one.
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