Buzzer and Doorbell 136
Magnetic Shields 136
Magnetic Levitation Transportation 137
Applied E&E: Electric Guitar 137
Chapter 10 Generators 139
10.1 ELECTRICAL ENERGY FROM MECHANICAL
ENERGY 139
Magnetic Induction 139
DC versus AC 141
Construction of a Generator 141
Generator Losses 143
10.2 TYPES OF GENERATORS 144
Separately Excited Field Generator 144
Applied E&E: Motion Simulators 145
Self Excited Generator 146
Voltage and Current Regulation 147
10.3 ALTERNATING CURRENT 148
Vectors 149
Average and Effective Values 150
Phase Displacement 150
Alternating Current Generator 151
Experiment 10-1: Building a Generator 152
10.4 THREE-PHASE GENERATORS 153
Paralleling Generators 154
Troubleshooting Generators 155
10.5 THE OSCILLOSCOPE 156
Voltage Measurement 157
Time Period and Frequency 157
Calibration 159
Intensity and Focus 159
Additional Features 159
Chapter 11 DC Motors 163
11.1 MOTOR OPERATION PRINCIPLES 163
A Practical Motor 165
Counterelectromotive Force 167
Overload Protection 167
Applied E&E: Submarine 168
Commutation and Interpoles 169
Speed Regulation 169
11.2 DC MOTORS 170
Shunt DC Motor 170
Series DC Motor 170
Compound DC Motors 171
Motor Starting Circuits 171
Thyristor Motor Controls 173
The Universal Motor 174
Permanent Magnet Motor 174
DC Servo Motor 174
8 Electricity & Electronics
SECTION
3