what is the use of commutator in dc motor if we supply ac ? commutator is used to convert ac to dc.and it is used to arrange the flux in unidirectional in case of dc supply. if we give ac as supply to dc motor what is the use of commutator?

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Sub link() Dim k As Integer Dim rand As Integer Dim URL As String Dim foldernum As Integer Dim folderstring As String Dim filenum As Integer Dim filestring As String k = 1 'for AC Numbers For i = 11 To 40 foldernum = 0 foldernum = 1000 + i folderstring = CStr(foldernum) folderstring = Mid(folderstring, 2, 3) folder = "ac" & folderstring 'folderstring = Sheets(2).Cells(i, 1) ' for Number of Random files For j = 1 To 10 rand = Int(Rnd * (200 - 1) + 1) filenum = 0 filenum = 1000 + rand filestring = CStr(filenum) filestring = Mid(filestring, 2, 3) 'URL = "http://ceobihar.nic.in/PSCDROM/ac" & folderstring & "/i" & folderstring & "0" & filestring & ".pdf" URL = "http://www.elections.tn.gov.in/pdfs/dt1/" & folder & "/" & folder & filestring & ".pdf" ' URL =http://www.wb.nic.in/wbeco/EROLLS/PDF/English/A001/a0010105 .pdf Cells(k, 1) = folderstring Cells(k, 2) = folder Cells(k, 3) = filestring Cells(k, 3) = URL k = k + 1 Next j Next i End Sub plz define it

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