Which of the following is NOT a potential cause of low power in a circuit?

The correct answer highlights that overloaded circuits are not a cause of low power in a circuit. Instead, overloaded circuits typically result in excessive current flow, which can lead to overheating and potentially tripping circuit breakers, rather than a decrease in power output.

Low power in a circuit can occur due to several other issues. For instance, dirty contacts can introduce resistance into the circuit, leading to voltage drops and reduced power delivery as the electrical connection becomes less effective. Loose connections can similarly create resistance points that disrupt the flow of electricity, resulting in lower power. Conductors that are too small for the current can also lead to voltage drops as they are unable to handle the required current without substantial resistance, thus detracting from the total available power in the circuit. Overall, overloaded circuits increase power consumption rather than diminish it, making them distinct from the other options presented.