What is one disadvantage of oil filled capacitors compared to electrolytic capacitors in similar sizes?

The choice of lower energy density as a disadvantage of oil-filled capacitors compared to electrolytic capacitors is consistent with key characteristics of these types of capacitors. Oil-filled capacitors typically have a greater volume or weight relative to their capacitance compared to electrolytic capacitors, which means they store less energy in the same physical space.

Electrolytic capacitors, especially in smaller sizes, are designed to provide higher capacitance values for a given size, which directly contributes to a higher energy density. This is due to their internal construction and the materials used, allowing them to store more charge per unit volume.

In practical applications, this means that if space or weight is a limiting factor, electrolytic capacitors may be more suitable than oil-filled capacitors, which can be bulkier for the same energy storage requirement. Therefore, when considering physical size and capacitance, the oil-filled capacitors are typically less efficient in terms of energy density when directly compared to electrolytic options.