When voltage fluctuations are found to be more than ±8%, a(n) ___ must be added to the system.

When voltage fluctuations exceed ±8%, implementing a voltage regulator, also known as a stabilizer, is essential for maintaining a stable supply of voltage in the system. Voltage regulators are designed to automatically adjust and maintain a consistent output voltage, regardless of input fluctuations or varying load conditions. This capability ensures that connected devices operate safely and effectively, protected from potentially damaging over- or under-voltage conditions.

The inclusion of a voltage stabilizer is vital in settings where sensitive electronics or machinery require tight voltage tolerances to function correctly. By keeping the voltage within specified limits, a voltage regulator helps to prevent malfunctions, reduce wear on electronic components, and enhance the overall reliability of the electrical system.

Other components, while they serve different purposes, do not adequately address the issue of wide voltage fluctuations to the same extent as a voltage regulator. Capacitors, inductors, and resistors each have their specific functions in electrical circuits but do not stabilize voltage in the way a voltage regulator does. Thus, a voltage regulator is the most suitable choice for mitigating excessive voltage variations.