Electrical Engineering › Section I · Sinusoidal waveforms and phasors › Topic I.3
Average and rms values
A changing waveform still has to be summed up by single numbers: how much dc it carries, and how hard it can heat a resistor. The average value answers the first question and the rms value the second, and the rms value is the one printed on every ac nameplate.
In this topic
- Two numbers for a changing wave
- The average value
- Average of half a sine wave
- A dc level plus an ac wave
- Worked example: a pulse train
- The effective, or rms, value
- The rms value of a sinusoid
- Worked example: the pulse train's rms
- Worked example: a heater on 120 V
- Other shapes, and dc plus ac
- Common mistakes to avoid
- Key takeaways
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