... Cho on mach xoay chiu gm R, L mc ni tip, hiu iờnh th hai u on mch cú dng100 2 sin100 ( )u t V= v cng dũng in qua mch cú dng 2 s(100 )( )4i co t A= .A . Tớnh R, LBi3Cho on mach xoay ... mch xoay chiu AB l 4 s(100 )i co t A = +. Ti thi im t = 0,04s cng dũng in trong mch cú giỏ tr.Bi 8 Cho on mch xoay chiu R, C mc ni tip. 100R = , 1,5C RU U=, tn s ca dũng in xoay ... cú t cm L = 0,318H (coi bng 1H), tin cú in dung 5C 5,3 10 F= ì (coi bng 310F6) v in tr thun R = 69,29 (coi bng 40 3 ). t vo hai u an mch mt hiu in th xoay chiu u = 240 sin...