TENSES #5

vScientist william sturgeon invented the electromagnet in 1824
( This use SIMPLE PAST TENSE because there are several verbs two and explain about invention in the past )

vDanish Scientist Hans Christian Orsted discovered in 1820 that electric current create magnetic field
( This use SIMPLE PAST TENSE because there are several verbs two and explain about invention in the past )

vThe iron was vanished to insulate it from the windings

     (This use PRESENT TENSE because there are several verbs and explain about usual condition)

vHis first electromagnet was a-shaped piece of iron that was wrapped with about 18 turns of bare copper wire     (This use PRESENT TENSE because there are several verbs and explain about usual condition)

vWhen a current was passed through the coil, the iron became magnetized and attracted other pieces of iron.

     (This use PRESENT TENSE because there are several verbs and explain about usual condition)