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Home > Ordnance Documents and other related manuals > > Figure 61 Period of Sine Wave
Frequency
Figure 62. Wavelenght

Electronic Principles
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ELECTRONIC PRINCIPLES - OD1647 - LESSON 1/TASK 1
alternating current or voltage completed each second is referred
to as the FREQUENCY. Frequency is always measured and expressed
in Hertz.
Alternating­current frequency is an important term to understand
since most ac electrical equipment requires a specific frequency
for proper operation.
(3) Period. An individual cycle of any sine wave represents a
definite amount of time. Notice that figure 61 shows 2 cycles
of a sine wave which has a frequency of 2 Hertz (Hz). Since 2
cycles occur each second, 1 cycle must require one­half second
of time. The time required to complete one cycle of a waveform
is called the PERIOD of the wave. In the example in figure 61,
the period is one­half second. The relationship between time
(t) and frequency (f) is indicated by the formulas
1 1
t = ­ and f = ­
f t
where t = period of time in seconds and
f = frequency in Hertz
FIGURE 61. PERIOD OF SINE WAVE.
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