Which term denotes a power specification of 120VAC, 60Hz, 15Amp circuit?

• A. Battery Backup
• B. Power Source
• C. Stairway Chairlift
• D. Major Components

Answer: (B)

The main idea is identifying what describes where electrical power comes from and its supporting characteristics. A specification like 120 VAC, 60 Hz, and 15 A defines the electrical supply that feeds a circuit, which is described by the power source. In North America, that combination represents a standard branch circuit supply: 120 volts, alternating current at 60 cycles per second, capable of delivering up to 15 amperes.

The other terms don’t denote the electrical supply characteristics. A battery backup refers to a system that takes over when main power is lost, not the standard power specification itself. A stairway chairlift is a particular piece of equipment, and major components is a broad category, neither of which describe the power source’s electrical ratings.