Dry battery, [27]
Earth, atomic constitution, [11]
Effective value, of ampere, [207];
of volt, [207]
Efficiency, of regenerative circuit, [182]
Electrical charge, [22]
Electricity, current of, [15], [16]
Electrodes, of vacuum tube, [41];
definition of, [41]
Electrolyte, definition of, [34]
Electrons, properties of, [4];
planetary, [10], [12];
rate of flow, [48];
vapor of, [39];
wandering of, [14]
Electron streams, laws of attraction, [200]