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alternating current ammeter amperes angle apparatus armature atom battery beam body called capacitance cathode cell centimeters charge circuit coil colors Compute condenser connected convex lens copper cubic cubic centimeter current ﬂows density Diagram diameter direct current direction disk distance dynes electric current electromotive force electrons energy engine equal equation experiment feet ﬁlament ﬁlled ﬁlm ﬁnd ﬁrst ﬁxed ﬂame ﬂow ﬂux focal length force fork frequency friction galvanometer gases glass grams heat inches inductance induction coil iron lamp lens lenses light liquid machine magnetic ﬁeld measure mercury metal meters mirror molecules motion motor moving object ohms parallel pipe plate poles position pounds pressure prism produced pump rays reactance reﬂected refraction resistance rotating screen shown in ﬁgure sound waves speciﬁc spectrum speed square steam surface temperature unit vacuum tube velocity vibrations voltage volts wave length weight wheel wire