How do you solve problems with transformers?

posted Feb 16, 2018, 1:37 PM by Barbara Fortunato   [ updated Feb 21, 2018, 6:57 AM ]
2: M 2/26 lab, 4: T 2/27 lab

Today, after finishing AP problems from last time, we'll do some transformer problems from the textbook Chapter 29 (These should be review from last year really.  If you're totally bored by these, find other problems on previous topics.)  
    Required:  37, 39, 41, 42, 43, 45, 46

HomeworkInduction Exam Monday, March 5th!  Watch the following videos on the electric field induced by a changing magnetic field.  Before watching though, think about the following situation.  So we know by F = qv x B that a MOVING charge in a magnetic field feels on a force and can be made to move.  Let's say we have a loop sitting in a constant magnetic field at first.  The charges sitting in the loop are not moving - even though these charges are in a magnetic field, there are no forces on the charges because their velocity is zero.  But as soon as we try to change that magnetic field, all of a sudden, the charges start to move - a current is induced.  That implies that there is a FORCE on those charges causing them to accelerate from REST.  Where does that force come from?  Can it be a magnetic force dictated by F = qv x B?  If not, what kind of force is it?  Seriously think about these questions!  Now watch the video.

Faraday's Law & Induced Electric Fields (lasseviren1)

Faraday's Laws and Induced Electric Fields 2 (lasseviren2)