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DM-II™ Fuse Replacement/Voltage Selection Procedure
True RMS Voltage and Current (volts and amps): True RMS is calculated by using Parseval’s
theorem:
Real Power P (watts): The real power that performs the work of creating heat, light, motion, machine
output, etc.
Apparent Volt-Amperes S (VA): The total power required to be generated to provide the desired work-
ing power output.
Reactive Volt-Amperes Q (VAR): The “non-working” or “phantom” power that is needed to charge
capacitors and magnetize inductors, i.e. reactive power to sustain electromagnetic fields.
Vrms = √Σ
V
2
n
n
P = Σ
V
rms
n
I
rms
n
COS (
θ
DIFF
n
)
n
Q = Σ
V
rms
n
I
rms
n
sin (
θ
DIFF
n
)
n
S =
V
rms
I
rms
Irms = √Σ
I
2
n
n
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