What is the result of low energy efficiency in a system?

Low energy efficiency in a system leads to higher operational costs. This is primarily because when a system consumes more energy to perform the same amount of work, it increases the overall energy expenditure. This situation means that more resources are required to maintain the same level of productivity, leading to elevated bills for electricity or fuel, and ultimately straining the budget of the operation.

In contrast, options suggesting lesser environmental impact, increased output quality, and improved energy conversion are linked to higher energy efficiency. A system designed for better energy use typically reduces waste and environmental damage while also optimizing quality and conversion processes. Hence, the consequences of low energy efficiency become evident in increased operational costs, making this the correct answer.