Audio
Live Sound Reinforcement ("LSR", or commonly "live sound" or "live audio") is the use of audio systems to make sure that everyone who is physically in attendance/on-site at an event can hear and understand the audible communications from the event leaders as well as possible. Worship services are our most important "live events".
If you have a heart to serve the Lord and you like Physics almost as much as (or more than) you like music, then your church could probably use your help as a volunteer!