What does a signal light connected across a load indicate?

A signal light connected across a load serves as an indicator of the load being energized. When the circuit is complete and power is being supplied to the load, the signal light turns on, providing a visual confirmation that electricity is flowing and that the load is active. This is especially useful in commercial food equipment settings as it allows technicians and operators to quickly assess the operational status of equipment.

When considering the context of this question, if the control contacts were open, the power supply would typically be interrupted and the signal light would not illuminate. Flickering of a neon light may suggest voltage issues or an unstable connection rather than a clear indication that the load is energized. Grounding issues concern circuit safety but do not directly relate to the indication of the load being powered. Thus, the correct answer reflects the primary role of the signal light in monitoring equipment function.