May Ask Help ... How I can know if the electrical motor is AC or DC ... In the case if i didn't find any ( Name Plate ) on it ... ? Also Asking If I Can Know ... For Wich Cases We Should Use ( AC ) OR ( DC ) ... Electrical Motors ??? I Mean Wich Kind Of Machines ... Because I'm Mechanical Engineer ... Working In The Field Of Machine Desiging (( Industrial Machinery )) ... If There Is Some Websites Or Tables That Helping Me To Get More Informations About The Practical Use Of Those Kind Of E. M. ... Inform Me About It ... Please Wish The Best Always ... Regards Eng. Luqman H. H.