What is an important characteristic of hollow cores in transformer construction?

Hollow cores in transformer construction play a significant role in reducing the size and weight of the transformer. This characteristic is particularly important because smaller and lighter transformers are easier to install and transport, making them more practical for various applications. The hollow structure allows for an optimized amount of core material to be used without sacrificing electromagnetic efficiency, thus achieving a balance between performance and compactness.

While factors such as efficiency, manufacturing ease, and inductance values are relevant to transformer design, the primary benefit of utilizing hollow cores is their contribution to minimizing both the overall size and weight of the device. This makes them especially advantageous in modern applications where space and weight constraints are critical factors.