Thomälen, Adolf, 1865-, Thomälen Adolf. Kurzes Lehrbuch der Electrotechnik. English · London, E. Arnold · leaf 252
rea must represent the total work done during aperiod. If this be divided by the time t-^ in which the work is done, we getthe mean work per second, that is, the mean power. This is given by theheight of a rectangle of the same area and on the same base as the shadedfigures. This height is found to… … Fig. 222 Fig. 223 in Fig. 223 is equal to P.da. Substituting the value of P found above, wefind the total area of the figure as follows: r P.da = (t^. R. sin^ a. da;Jo Jo but / sm^a.da=(- sin a. cos a) =-, Jo \2 2 /o 2 hence, the shaded area in Fig. 223 is equal to i^ .R i sin^ a . da = i^ .R .…
Electrical engineering
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