Which type of capacitor is least likely to be classified as high voltage (above 1,000v)?

Electrolytic capacitors are generally used in applications that require higher capacitance values but are often limited in their maximum voltage ratings compared to other types of capacitors. They are primarily used in power supply filtering and decoupling applications, where voltages are typically below 1,000 volts. The construction of electrolytic capacitors, which includes a liquid or gel electrolyte, makes them less suitable for high-voltage applications as they are more prone to failure under extreme voltage conditions.

In contrast, film capacitors, mica capacitors, and tantalum capacitors typically have better voltage ratings and can be designed to operate at voltages well above 1,000 volts. Film capacitors are often utilized in high-voltage applications due to their excellent insulation properties and durability. Mica capacitors are known for their stability and reliability at high frequencies and voltages. Tantalum capacitors, while sensitive to over-voltage conditions, can also be constructed for higher voltage applications, albeit with caution due to their potential failure mechanisms under certain conditions.

Thus, the classification of electrolytic capacitors as less likely to be high voltage is attributed to their design and usage limitations.