Which of these statements is FALSE with respect to low voltage systems?

The statement identifying that you can dim each output of the transformer separately is inaccurate because typical low voltage transformers (specifically incandescent or magnetic transformers) do not allow for independent dimming of each output. Instead, they generally provide a single output voltage to multiple fixtures or loads. In most setups, if dimming is desired, it has to be applied to the entire output simultaneously, not on an individual basis.

In contrast, the other statements hold true in the context of low voltage systems. The capacity of a transformer is indeed measured in watts or volt-amperes, reflecting the power it can handle without overheating. The secondary side of the transformer is responsible for supplying power to the low voltage conductors, which is essential for their operation. Additionally, it is typically the case that a dimmer should control the primary side of the transformer; this allows for effective dimming of the entire output while maintaining the characteristics of the low voltage system. These key aspects reinforce why the correct answer is focused on the inability to independently dim each transformer output.