Chapter 1 - Units of Measurement
Electrical Quantities and Derived Units
Letter symbols are used to represent both quantities and their units. As a rule, Italic letters stand for the quantity and non-italic letters stand for the unit.
Electrical Quantities and Derived Units
| Quantity | Symbol | SI Unit | Symbol |
|---|---|---|---|
| Capacitance | C | Farad | F |
| Charge | Q | Coulomb | C |
| Conductance | G | Siemens | S |
| Energy (Work) | W | Joule | J |
| Frequency | f | Hertz | Hz |
| Impedance | Z | Ohm | Ω |
| Inductance | L | Henry | H |
| Power | P | Watt | W |
| Reactance | X | Ohm | Ω |
| Resistance | R | Ohm | Ω |
| Voltage | V | Volt | V |
Magnetic Quantities and Derived Units
| Quantity | Symbol | SI Unit | Symbol |
|---|---|---|---|
| Magnetic Field Intensity | H | Ampere-turns/Meter | At/m |
| Magnetic Flux | φ | Weber | Wb |
| Magnetic Flux Density | B | Tesla | T |
| Magnetomotive Force | Fm | Ampere-turn | J |
| Permeability | µ | (Webers/Ampere-turn) x Meter | (Wb/At) x m |
| Reluctance | R | Ampere-turns/Weber | At/Wb |
