Advanced Electrical Principles. Presented By:Cosmas Rashama ;. Course Outline. Signals Amplitude Phase Frequency Fourier Analysis of Signals Linear, non-linear, Time-varying and Time-invariant Sources Frequency Spectra Harmonic Distortions Harmonics in 3-phase systems
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Advanced Electrical Principles
Presented By:Cosmas Rashama
F = 1/T = 1/5x10-3hz
A relative measurement defined in relation to an unshifted wave.
Delay, on the other hand, is how far in seconds you must shift a waveform to get it to align with a reference unshifted waveform
Phase differences represent the way the two functions are aligned with respect to each other at all times
Amplitude axis has no values less that zero
In this spectral representation, called a magnitude spectrum amplitudes cannot be less than zero--it is not possible to have negative amounts of energy.
Line spectra exactly represent periodic signals like sine waves and square waves that are (at least theoretically) unbounded in time.
One of the most convenient features of frequency domain representations is that many different frequencies can be plotted simultaneously on the same figure.
This figure does not show us anything about the phase relationships among the harmonics which were obvious in the time-domain figures earlier.
We call spectra like this harmonic spectra rather than line spectra.
Harmonic Spectra Associated with quasiperiodic signals that are bounded in time.
Continuous Spectra Associated with aperiodic sounds.
which create high current flow with harmonic frequency components.
Output voltage is always higher than the input voltage
Deterministic Signals are signals which are completely specified as a function of time.