Symbol

Meaning

t

Time duration

V

Voltage, potential difference

V̲

Complex voltage

I

Electrical current

I̲

Complex current

Z̲

Complex impedance

|Z̲|

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