AC1 Fundamentals Unit 1 – The AC Waveform Generator
UNIT 1 – THE AC WAVEFORM GENERATOR
UNIT OBJECTIVE
At the completion of this unit, you will be able to operate a basic ac waveform generator by
using equipment provided.
UNIT FUNDAMENTALS
Alternating current (ac)differs from direct current in that it constantly changes in level and
polarity.
The level and polarity of a dc waveform remain constant over time, as shown.
An ac waveform is produced when current or voltage changes in polarity over time. These
changes usually occur in a repeating pattern. A common ac sine wave is shown.
The current or voltage level of an ac waveform is referred to as the amplitude. Amplitude, as in
dc, is measured in volts (V) for emf and amperes (A) for current.
One complete repetition of a waveform is called a cycle, and the number of cycles that occur in
one second is called the frequency (f).Frequency is measured in hertz (Hz).