Final answer:
In an emergency electrical configuration, the available ATC transponder system is the emergency backup system.
Step-by-step explanation:
In an emergency electrical configuration, the ATC transponder system available is the emergency backup system. The emergency backup system is designed to provide limited function and is used when the primary ATC transponder system is not functional due to electrical failure or other emergencies.
The emergency backup system typically consists of a separate power source and backup transponder. It may have limited functionality and may only provide basic transponder capabilities such as squawking a specific emergency code or transmitting position information.
For example, in aviation, if the primary ATC transponder system fails due to electrical issues, the emergency backup transponder system can be used to communicate with air traffic control and maintain compliance with regulations.