reverse field
hi sorry for the confusion.
i can now view your reply, The teacher said if correctly done they could make things go backwards(such as spindle on an old electric meter)or the motor on a fan etc.
i am puzzled ? although i am not the smartest person regarding electronics, i am sure someone will have the knowledge.
thanks.
the teacher said to build not to try unless under controlled circumstances and he will test and mark accordingly.
my son says his mates have completed but will not tell him how
many thanks