Explanation of Using an 8uF 221 Electrolytic Capacitor in a Circuit:

Understanding the Capacitor Marking:
- The marking "8uF 221" indicates that the capacitor has a capacitance of 8 microfarads and a voltage rating of 221 volts.

Potential Difference Across the Capacitor:
- The potential difference across a capacitor in a circuit depends on the voltage rating of the capacitor and the voltage applied to the circuit.
- In this case, the capacitor is rated for a maximum voltage of 221 volts.
- The potential difference across the capacitor should not exceed this value to prevent damage to the capacitor.

Using the Capacitor in a Circuit:
- When selecting a capacitor for a circuit, ensure that the voltage rating of the capacitor is higher than the maximum voltage that will be applied across it.
- In this scenario, the 8uF 221 capacitor can be safely used in a circuit where the potential difference across the capacitor is less than or equal to 221 volts.
- If the potential difference across the capacitor exceeds 221 volts, it may lead to the capacitor failing or even causing damage to the circuit.

Conclusion:
- The 8uF 221 electrolytic capacitor can be effectively utilized in a circuit where the potential difference across the capacitor does not exceed 221 volts. It is crucial to adhere to the voltage rating of the capacitor to ensure reliable and safe operation within the circuit.