... Bnthõntụicngchkhuyờnhcsinhnờnvgintheosliumcỏcemoc,chchakhcphcnhngkhuytimtrờn.3.3.3.3.BthớnghimkhosỏtMchR,L,Cnitipvcỏcnghanngctrangbkhỏychocỏctrngphthụng,viclprỏpmchinrtddng:chcú3linhkinmcnitipv1nghoinỏp,hcsinhchcnthayivtrớ c cchtol c ccỏcsliucno.Vỡthhcsinhcúthtmỡnhkimchnglýthuytóhc.4.4.4.4.Thụngquaginvectcabithchnhcnchngminhchohcsinhthycslchphagiacỏcinỏp(õylskhỏcbitgiadũnginxoaychiuvdũnginkhụngi).5.5.5.5.Trongsỏchgiỏokhoa,hngdnbithchnhkhiocundõykhụng c lithộp,tụinghnờndựngcundõycúlithộpvỡhailớdo:MtlchngminhctcmLcacundõyphthucvolithộp;HailnhcúlithộpmtcmLcangdõytngdntiinỏpULtng,ginvectrừhn.6.6.6.6 .C clinhkintrongthựngKhosỏtmchR,L,Ckhiochoginvectkhụngcõnivg c lchphagiainỏpvdũnginquỏln(trờn800)iunytrongthctnờntrỏnh.Vynờncnlmgimg c .Khigingdycỏctitthchnh,tụiluụntỡmcỏchxlớnhngnhcimtrờnphộpohplớhn,ginvectcac c inỏprừrngvcõnihn;ngthi,giiỏpcthcmccahcsinh,giỳphcsinhsỏngtotrongvichcvhnh.Saunhiulnnghiờncuvtinhnhovi c clinhkinc c cthụngskhỏcvisỏchgiỏokhoa(R,cundõycúlithộp,nitip2cundõy, )tụióoccỏcgiỏtrc c inỏptngicõnivcúcginvectgngingnhcỏchỡnhsỏchgiỏokhoavsỏchgiỏoviờn.Sỏngkin:NõngcaohiuqubithchnhKhosỏtmchR,L,Cnitip.Tỏcgi:MaiThPhc,tLýKTCụngnghip,trngTHPTNguynTróiTrang3/12II.II.II.II.NhNhNhNhngngngngbibibibinnnnphphphphỏỏỏỏppppthththth c c c chihihihin:n:n:n:A.A.A.A.LLLLaaaachchchchnnnnlinhlinhlinhlinhkikikikin:n:n:n:1.1.1.1.LinhkintrongthựngKhosỏtmchR,L .C :RRRRlbintrnỳmxoay c giỏtrt10n100.ChnRRRR====100100100100 ;C= 4àF;cucucucunnnnddddõõõõyyyykhkhkhkhụụụụngngngnglllliiiiththththộộộộpppp. C cgiỏtrocchoginvectkhụngcõni;gúclchquỏln.2.2.2.2 .c ktquhplớhn,thayRRRR====680680680680(khụngcúR=220hoc270nhsỏchgiỏokhoaódựng) ;C= 4àF;cucucucunnnnddddõõõõyyyyc c c c úúúlllliiiiththththộộộộpppp.B.B.B.B.TiTiTiTinnnnhhhhnhnhnhnho:o:o:o:thchinttbithchnh,tụitinhnhqua4bc:BBBB c c c c1111::::obngVụnkxỏcnhUR;U C ;Udõy;URdõyvUMQ.BBBB c c c c2222::::obngthcvcompa,vgin,xỏcnhUr;UL;UMQ;.BBBB c c c c3333::::Tớnhtoỏncỏcilng;tỡmr;L ;C; cos;.BBBB c c c c4444::::Sosỏnhcỏcktquvaragiỏtrcar;L ;C; cos;.1.1.1.1.oooobbbbngngngngVVVVụụụụnnnnkkkk::::NguNguNguNgunnnnc c c c úúúUUUU====12V12V12V12V;;;;ffff====50Hz50Hz50Hz50Hz1.1.1.1.1.1.1.1.Dựngcỏclinhkintrongthựngthớnghim:RRRR====100100100100 ;C= 4àF(chegiỏtrcaCli);cundõykhkhkhkhụụụụngngngngc c c c úúúlllliiiiththththộộộộpppp:UR=1,25V;Udõy=0,6V;URdõy=1,36V;U C =12,05V;UMQ=12,12V(cthhingin1,trang4)1.2.1.2.1.2.1.2.Dựngcundõyc c c c úúúlllliiiiththththộộộộpppp;RRRR====100100100100 ;C= 4àF.UR=1,6V;Udõy=0,805V;URdõy=2,1V;U C =13,32V;UMQ=12,50V(cthhingin2,trang4)1.3.1.3.1.3.1.3.Bõygi,dựngRRRR====680680680680 (c trongthựngDũnginkhụngilp11);cundõyc c c c úúúlllliiiiththththộộộộpppp ;C= 4àF:UR=8,24V;Udõy=0,74V;URdõy=8,28V;U C =8,45V;UMQ=12,01V(cthhingin3,trang5)NhNhNhNhngngngngvvvvnnnn c c c cnnnnlllluuuuýýýýtrongtrongtrongtrongkhikhikhikhithththth c c c chihihihinnnnbbbb c c c cnnnny:y:y:y:*** *C csocnhyliờntcvgiỏtrkhỏcnhau,phionhiuln,ghilicỏcgiỏtrrichngiỏtrxuthinnhiunht.****Ngundựng12Vnhnggiỏtrinỏpoclilnhn12V(onhiulncngcúgiỏtrnhth).õylthctchagiithớchc ,c ldosocainkchờnhlchsovingun.****Khidựngcundõycúlithộp,giỏtrUdõy c tnglờn (c ngR=100)****Cundõycúkhikhụngdninvỡalithộpra,vonhnggiỏtrVụnkkhụngivrtbộ,lỳcthnythỡnờnkimtracht2udõy.Sỏngkin:NõngcaohiuqubithchnhKhosỏtmchR,L,Cnitip.Tỏcgi:MaiThPhc,tLýKTCụngnghip,trngTHPTNguynTróiTrang4/122.2.2.2.oooobbbbngngngngthththth c c c cvvvvcompa.compa.compa.compa.VVVVgigigiginnnnvvvvộộộộctctctct::::2.1.2.1.2.1.2.1.GiGiGiGinnnn1:1:1:1:vvvviiiiRRRR====100100100100;;;;cucucucunnnnddddõõõõyyyykhkhkhkhụụụụngngngngc c c c úúúlllliiii;;;;ttttllll::::1V1V1V1V====1cm.1cm.1cm.1cm. C chv:+Vvectcúdi1,25cm.+Dựngcompav2vũngtrũncúbỏnkớnhUdõydi0,6cmtõmNvURdõydi1,36cmtõmM.HaivũngtrũngiaonhautiP.=;=;=Túsuyra=;=****Khiobngthctheotlxớchóchn:(ochớnhxỏcn1mm)Ur=0,3V;UL=0,48VvUMQ=11,9V;=850****Ginvectkhụnghplớ;gúcquỏln.2.2.2.2.2.2.2.2.GiGiGiGinnnn2:2:2:2:VVVViiiiRRRR====100100100100;;;;cucucucunnnnddddõõõõyyyyc c c c úúúlllliiiiththththộộộộp.p.p.p.Tngt:Ur=0,36V;UL=0,72V;UMQ=12,2V;=820****Ginvect 2c ULlnhnginvect1vỡLtng,ZLtngtheovtngtrZgim,cngdũnginquamchstngvinỏpULcngtng;gúccúgim.****Ginvectcúrừhnmtchỳtnhnggúcvnquỏln.UrURURMNURdõyMPUdõyNPNHULHPNNNNtrtrtrtr c c c ciiiiMMMMPPPPQQQQHHHHGiGiGiGinnnn1111HHHHNNNNPPPPMMMMtrtrtrtr c c c ciiiiQQQQGiGiGiGinnnn2222Sỏngkin:NõngcaohiuqubithchnhKhosỏtmchR,L,Cnitip.Tỏcgi:MaiThPhc,tLýKTCụngnghip,trngTHPTNguynTróiTrang5/12*Ginvectcúgúclchphagiauviln,iunytrongthctcnphitrỏnhkhisdngcỏcthitbinvỡthginnykhụnghplớ.2.3.2.3.2.3.2.3.GiGiGiGinnnn3:3:3:3:VVVViiiiRRRR====680680680680;;;;cucucucunnnnddddõõõõyyyyc c c c úúúlllliiiiththththộộộộp.p.p.p.KhiobngthcUr=0,32V;UL=0,65V;Ung=11,7V;=410.VỡRvZ C khụngchờnhlchnhaunhiunờnginvectcúphncõnihn,gnginghỡnh19.2trongsỏchgiỏokhoalp12cbn;gúclchphagiainỏpvdũngingiminhiu.NhNhNhNhngngngngvvvvnnnn c c c cnnnnlllluuuuýýýýtrongtrongtrongtrongkhikhikhikhithththth c c c chihihihinnnnbbbb c c c cnnnny:y:y:y: *C cgiỏtrUr,UL,UngcotrctipbngthcnờnvictỡmgiaoimPca2inỏpUdõyvURdõyphihtsccnthnvchớnhx c. *Khicundõycúlith c cinỏputngvỡZLtng;Zgim;Itng.*KhidựngR=68 0c cinỏpURvU C khụngchờnhlchnhiuvỡthginvectthayirtrừ,nhtlgúclchpha.3.3.3.3.TTTTớớớớnhnhnhnhtotototoỏỏỏỏnnnnc c c c ỏỏ c c c ciiiillllngngngng::::3.1.3.1.3.1.3.1.VVVViiiiRRRR====100100100100;;;;cucucucunnnnddddõõõõyyyykhkhkhkhụụụụngngngngc c c c úúúlllli.i.i.i.r1=rRURU=24L1=..2LRU ... 7.7.7.7.Vẽgiảnđồvectơ:theotỉlệđãchọn(1cm1cm1cm1cmttttươươươươngngngngứứứứngngngng1V1V1V1V)MMMMNNNNPPPPQQQQRRRRrrr r, ,,,LLLLC C C C PhPhPhPhụụụụllllụụụ c c c c1111Sángkiến:NângcaohiệuquảbàithựchànhKhảosátmạchR,L,Cnốitiếp.Tácgiả:MaiThịPhư c, tổLý–KTCôngnghiệp,trườngTHPTNguyễnTrãiTrang10/128.8.8.8 .C= 2 .R C UfRUπ= ± 9.9.9.9.r=rRURU= ... Bnthõntụicngchkhuyờnhcsinhnờnvgintheosliumcỏcemoc,chchakhcphcnhngkhuytimtrờn.3.3.3.3.BthớnghimkhosỏtMchR,L,Cnitipvcỏcnghanngctrangbkhỏychocỏctrngphthụng,viclprỏpmchinrtddng:chcú3linhkinmcnitipv1nghoinỏp,hcsinhchcnthayivtrớ c cchtol c ccỏcsliucno.Vỡthhcsinhcúthtmỡnhkimchnglýthuytóhc.4.4.4.4.Thụngquaginvectcabithchnhcnchngminhchohcsinhthycslchphagiacỏcinỏp(õylskhỏcbitgiadũnginxoaychiuvdũnginkhụngi).5.5.5.5.Trongsỏchgiỏokhoa,hngdnbithchnhkhiocundõykhụng c lithộp,tụinghnờndựngcundõycúlithộpvỡhailớdo:MtlchngminhctcmLcacundõyphthucvolithộp;HailnhcúlithộpmtcmLcangdõytngdntiinỏpULtng,ginvectrừhn.6.6.6.6 .C clinhkintrongthựngKhosỏtmchR,L,Ckhiochoginvectkhụngcõnivg c lchphagiainỏpvdũnginquỏln(trờn800)iunytrongthctnờntrỏnh.Vynờncnlmgimg c .Khigingdycỏctitthchnh,tụiluụntỡmcỏchxlớnhngnhcimtrờnphộpohplớhn,ginvectcac c inỏprừrngvcõnihn;ngthi,giiỏpcthcmccahcsinh,giỳphcsinhsỏngtotrongvichcvhnh.Saunhiulnnghiờncuvtinhnhovi c clinhkinc c cthụngskhỏcvisỏchgiỏokhoa(R,cundõycúlithộp,nitip2cundõy,...