Watt, [235]
Wave form, [182]
Wave length, relation to frequency, [98], [122];
defined, [122]
Wire, inductance of, [104]
Wire, movement of electrons in, [14];
emission of electrons from, [37]
Wire telephony, [253]
Wired wireless, [255];
advantages of, [257]
X-rays, [147]
Zero coupling, [177]
Zinc, electrode for battery, [23]