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1．ELECTRICITY 1

2．ELECTRICITY AT REST 3

3．ELECTRICITY ON THE MOVE 9

4．WHAT ELECTRICITY IS 14

5．MAGNETISM 18

6．MAGNETISM AND ELECTRIC CURRENTS 23

7．ELECTRICITY AND CHEMISTRY 30

8．AMPS，VOLTS，AND OHMS 34

9．ELECTRIC POWER 39

10．MEASURING ELECTRIC CURRENTS 45

11．HOW ELECTRIC POWER IS GENERATED 51

12．ALTERNATING CURRENT（A．C．） 57

13．POWER STATIONS 67

14．HOW ELECTRIC POWER IS DISTRIBUTED 72

15．ELECTRIC MOTORS 81

16．ELECTRIC LIGHTING AND HEATING 88

VOCABULARY 94