salient-pole generator | Types of Alternating-Current Generators |

saturation curve | The Diode |

saturation of iron | Permeability and Saturation of Iron |

Scott connection | The Scott, or T, Connection |

screen grid | Tetrodes |

secondary | The Rotating Magnetic Field |

secondary battery | Secondary (Storage) Batteries |

self-excited generator | Building up Voltage of a Self-Excited Generator |

| Change in Characteristics |

self-induction | Inductance |

semi-enclosed motor | Rating of Enclosed Motors |

series circuit | Multi-Part Series Circuit with Resistance and Inductance |

| Series Circuits With Resistance and Capacitance |

series generator | The Series Generator |

series resistor | Resistors in Series |

series resonance | Parallel Circuits With Resistance and Capacitance |

series-relay starter | Series-Relay Starters |

shaded pole | The Shaded-Pole Induction Motor |

shading coil | The Shading Coil |

shunt | Direct-Current Ammeter |

shunt connected terminals | Field Excitation of Shunt Generator |

shunt generator | Performance of a Shunt Generator |

shunt motor | Characteristics of Shunt Motors |

shunt-field circuit | Loss in Shunt-Field Circuit of DC Generator |

single-phase circuits | Classes of Circuits |

single-phase motor | The Shaded-Pole Induction Motor |

single-phase motors | Need for Small Motors |

slip | Principle of Operation |

smooth-core generator | Types of Alternating-Current Generators |

solenoid | Magnetic Circuit |

| Application of Magnets |

| Pull of Magnets and Solenoids |

space vector | Use of Vectors |

speed of generator | Operation of Speeds Above or Below Rated Speed |

speed regulation | Speed Regulation |

split-phase motor | The Capacitor Motor |

splitphase motor | The Split-Phase Induction Motor |

squirrel-cage rotor | The Squirrel-Cage Rotor |

stabilizing winding | Stabilizing Windings |

starter | Automatic Starters |

| Types of Automatic Motor Starters |

| Series-Relay Starters |

starting | Starting of Polyphase Induction Motors |

starting current | Starting of D-C Motors |

starting rheostat | Starting of D-C Motors |

starting winding | The Split-Phase Induction Motor |

static electricity | Static Electricity |

stator | The Rotating Magnetic Field |

storage battery | Secondary (Storage) Batteries |

stranded conductors | Resistance of Conductor |

stray load loss | Stray Load Loss |

stroboscope | The Stroboscope |

structure of matter | The Structure of Matter |

suppressor grid | Pentodes |

susceptance | Conductance,Susceptance, and Admittance |

switch | Direct-Current Transients |

synchronizing current | Synchronizing Current |

synchronous condenser | The Synchronous Condenser |

synchronous impedance | Synchronous Impedance |

synchronous motor | General Characteristics of the Synchronous Motor |

| Starting of Synchronous Motors |

| Running Conditions |

| Vector Diagram of the Synchronous Motor |

| Synchronous-Motor Applications |

synchronous speed | Principle of Operation |