[wee]

R (60 W) = 240^2/60 = 960 OHM R (100 W) = 240^2/100 = 576 OHM I = 240 / ( 960 + 576 ) = 0.15625 AMP P = RI2 P (60 W) = 960 * 0.15625^2 = 23.43 W P (100W) = 576 * 0.15625^2 = 14.06 W بنابراین لامپ 60 وات روشنتر است