Symbols Used
Symbol Meaning
t Time duration
V Voltage, potential difference
V Complex voltage
I Electrical current
I Complex current
Z Complex impedance
|Z| Modulus of complex impedance
f Frequency
δ Temperature in °C
Σ Sum, result
Ω Unit of electrical resistance
α Angle
φ, ϕ Phase angle. With subscripts: specific angle between a defined current
and a defined voltage.
τ Time constant
ΔT Temperature difference in K
P634 A3 Glossary
A3-8 P634/EN M/R-42-A // P634‑311‑653
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