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At the end of the section, you should be able to:
At the end of the section, you should be able to:
Determine key parameters of sinusoidal waveforms.
DC versus AC waveforms
DC versus AC waveforms
DC voltage or current waveform is fixed in magnitude and direction/sign (either positive or negative). E.g. current from a battery as shown below.
DC voltage or current waveform is fixed in magnitude and direction/sign (either positive or negative). E.g. current from a battery as shown below.
AC voltage or current waveform has both their magnitude and direction/sign varying with time. Examples are shown below.
AC voltage or current waveform has both their magnitude and direction/sign varying with time. Examples are shown below.
Characteristics of sinusoidal waveform
Characteristics of sinusoidal waveform
A sine wave is an example of a sinusoidal waveform.
A sine wave is an example of a sinusoidal waveform.
A graphical summary of key parameters: peak-to-peak value, amplitude and period.
A graphical summary of key parameters: peak-to-peak value, amplitude and period.
Note: Frequency = 1/Period and the unit is hertz (Hz).
Note: Frequency = 1/Period and the unit is hertz (Hz).
Average value of waveform
Average value of waveform
Root-mean-square (RMS) value
Root-mean-square (RMS) value
A quick summary:
A quick summary:
Something extra!
Something extra!
Check your understanding
Check your understanding
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