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Vrms
True RMS phase-to-neutral voltage
Vthd
Total harmonic distortion of phase-to-neutral voltag
Vthdf
Total harmonic distortion of phase-to-neutral voltage in %f
Vthdr
Total harmonic distortion of phase-to-neutral voltage in %r
Vunb
Voltage unbalance
W
Active power
Wdc
DC power
Wdch
DC energy
Wh
Active energy (also watt-hour)
Prefixes of International System (SI) units
Prefix
Symbol
milli
kilo
Mega
Giga
Tera
Peta
Exa
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Multiplies by
m
10
-3
k
10
3
M
10
6
G
10
9
T
10
12
P
10
15
E
10
18
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