Difference between revisions of "Calculate RMS"
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| − | + | Not all forces and sources of power are in steady states. Many sources of power vary by their nature. This variation, when expressed in simple mathematics, often results in descriptions of the source that vary into both positive and negative numbers. A good example of the variation between positive and negative numbers exhibited by power sources is house current. As house current is generated by rotating magnetic processes, the voltage provided at the house outlets is sinusoidal. This sinusoidal power causes positive currents to flow into the house when the sinusoid is in a positive part of the waveform, and draws current back out of the house when the sinusoid is in a negative part of the waveform. This alternating current, commonly called AC, can make it seem at first glance that the total power to the house is zero. However, power has no sign. Both positive and negative waveforms deliver power to the house, differing in electrical angular phase, but not in power. To express the delivery of power to the house, simple signed algebra is inadequate. The waveform must be treated as if it is always positive. Compensation also must be made for the variation in the waveform magnitude. A sinusoidal waveform varies between peak and zero constantly, and delivers different amounts of power depending on the electrical angle of the waveform. The concept of Root Mean Square (RMS) takes both the sign reversal and magnitude variation of the drive waveform into account. Although RMS calculations can be useful in some other areas, RMS calculations were originally defined to accurately express the electrical power being supplied by an AC waveform. RMS values are a statistical representation of power delivered by a varying power source. Use these tips to learn how to calculate RMS. | |
| − | [[Category:Measuring Power Current and Energy]] | + | [[Category: Measuring Power Current and Energy]] |
== Steps == | == Steps == | ||
# Understand how units are expressed electrically. | # Understand how units are expressed electrically. | ||
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#Calculate the RMS power of a sawtooth wave. A sawtooth wave is less efficient than a sine wave in delivering power. The relationship between peak and RMS of a sawtooth is that RMS equals A divided by the square root of 3. | #Calculate the RMS power of a sawtooth wave. A sawtooth wave is less efficient than a sine wave in delivering power. The relationship between peak and RMS of a sawtooth is that RMS equals A divided by the square root of 3. | ||
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== Related Articles == | == Related Articles == | ||
