🔍 Key Concepts

• In AC (alternating current) electrical theory, the number of complete cycles per second has a specific name. • Think about common power systems, like 60 cycles per second in the U.S. or 50 cycles per second in many other countries. • Distinguish between the shape of the wave, the timing between waves, and the count of cycles per second.

💭 Think About

• Which term is used to describe "how many times" an AC voltage repeats its cycle in one second? • Which term refers instead to the shape of the AC signal (sine wave, square wave, etc.) rather than how often it repeats? • Which choice is commonly measured in units of hertz (Hz)?

✅ Before You Answer

• Identify which option is measured in hertz (Hz). • Eliminate any option that describes shape rather than rate of repetition. • Ask: which term do we use when we say "60 Hz shipboard power" or "50 Hz shore power"?