Page 11 - Teach Yourself Electricity and Electronics

Contents xi

Unwanted inductances 195
Quiz 195

11 Capacitance 199
The property of capacitance 199
Practical capacitors 201
The unit of capacitance 201
Capacitors in series 202
Capacitors in parallel 203
Dielectric materials 204
Paper capacitors 204
Mica capacitors 205
Ceramic capacitors 205
Plastic-film capacitors 206
Electrolytic capcitors 206
Tantalum capacitors 206
Semiconductor capacitors 207
Variable capacitors 207
Tolerance 209
Temperature coefficient 210
Interelectrode capacitance 210
Quiz 211

12 Phase 215
Instantaneous voltage and current 215
Rate of change 216
Sine waves as circular motion 217
Degrees of phase 218
Radians of phase 221
Phase coincidence 221
Phase opposition 222
Leading phase 222
Lagging phase 224
Vector diagrams of phase relationships 225
Quiz 226
13 Inductive reactance 231

Coils and direct current 231
Coils and alternating current 232
Reactance and frequency 233
Points in the RL plane 234
Vectors in the RL plane 235
Current lags voltage 237
Inductance and resistance 238
How much lag? 240
Quiz 243