Voltage or volts
E
or
V
=
volts V
Amperage or current
I
=
amperes, amps A
Resistivity or resistance
R
=
ohms Ω
Wattage or power
P
=
watts W
For
R
take impedance
Z
Electric power
P
:
watts
Voltage
V
:
volts
Amperage
I
:
amps