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Examples: Amplitude and Frequency<^< Amplitude and Frequency | Course Index | Measuring Angles >^> Example 1:
A sine wave voltage has a maximum value of 100V and a frequency of 50Hz. Determine the instantaneous voltage present 2.5ms from the start of the cycle.
We can determine the voltage at any instant of time using: v = Vmaxsin(ωt) = Vmaxsin(2πft) where Vmax = 100V and f = 50Hz. When Vmax = 2.5ms the instantaneous voltage will be given by: v = 100 sin(2πx50x0.0025) Example 2:
A waveform has a frequency of 200Hz. What is the periodic time of the waveform?
t = 1/f = 1/200 = 0.005s (or 5ms). Hence the waveform has a periodic time of 5ms. Example 3:
A waveform has a periodic time of 2.5ms. What is its frequency?
f = 1/t = 1/2.5x10-3 = 1/0.0025 = 400Hz <^< Amplitude and Frequency | Course index | Measuring Angles >^> |