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Which consequence results when a filter capacitor's series resistance increases in a switched-mode power supply?

A)Increased output voltage ripple
B)Reduced switching transistor stress
C)Improved transient response speed
D)Lower electromagnetic interference emissions

💡 Explanation

Increased equivalent series resistance (ESR) causes greater voltage drop across the capacitor during charge/discharge cycles because the voltage drop increases with resistance; therefore, the output experiences higher ripple, rather than improvements in transient response or reduction in EMI.

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