Final answer:
To eliminate the pulsating of the output voltage in a circuit, a filter capacitor is added. This component helps smooth out the fluctuations, creating a more stable DC voltage.
Step-by-step explanation:
The pulsating of the output voltage in a circuit can be eliminated by adding a filter capacitor. The filter capacitor smooths out the pulsations in the DC voltage that result from the AC to DC conversion process. In a circuit, this becomes particularly important in power supply circuits to ensure a stable DC output. For more elaborate smoothing, multiple capacitors and inductors can be arranged in various configurations called filter circuits or voltage regulators to minimize the ripple in the DC output further. Additionally, electronic methods can be employed, such as using a voltage regulator chip, to achieve ripple-free DC voltage.