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AC CURRENT EAS 5407: Mechatronic Systems Arthur AC Line Waveform AC Line Feature Amplitude = 110 V Frequency = 60 Hz Period = 1/f = 16.67 ms RMS of Voltage = 110/sqrt(2) = 77.79 V Typical RMS Current of Household = 30~5 A AC v.s. DC More Efficient to Transmit More Easier to Drive Motor Can Be a 60Hz Signal More Efficient Transmit All the power transmit lines have internal resistance. This resistance is in serial with the household electrical applicants. Because the power wasted on the transmit lines is equal to I*I*R. To reduce the wasted power, we must try to reduce the current of the transmit lines. Because the total power is constant, P=U*I. So we can make the voltage very high to reduce the current amplitude. But only AC can use transformer to change voltage. Although DC can also change voltage with the help of Inverter, but it is less stable and robust.