- 1. Alternating Current.
Alternating current is an electrical current that alternates its direction of flow (cf DC). The frequency (or number of cycles per second) is measured in hertz.
- 2. Air Conditioning.
Air Conditioning units (which cool and de-humidify the air) are often rated in BTUs.
- 3. Administrator Account.
An administrator account is a user account which has full administrative rights. Depending on the context and operating system an administrator account may have full administrative rights over the local PC or over all PCs in a domain. cf LUA.