Measurement of voitage and resistance is different for AC and DC. AC voltage is measured as rms because of the sinusoidal nature of the waveform. Look on a scope; the trace crosses above and below the zero line.. DC is measured in straight volts. DC appears as a straight line on a scope.
In AC work, resistance is sometimes expressed as impedance; i.e. in measuring the “resistance” of a speaker coil, also expressed in ohms (usually 4, 8 or 16 ohms.)
Stage Wizards Lighting and sound designer
1981 SD 328,000
1985 300TD, 266,000
1984 300 TD, 267,000