1. During a lightning storm, it is safest to stand in the middle of a field, rather than taking shelter under a tree. Many deaths caused by lightning relate to this. Why is this the case?
2. How can an electric current cause a magnetic field? Describe how some common device that uses this principle to accomplish something useful.
3. Using general terms, explain how a DC motor works.
4. How does a transformer work? What does it do to an electrical current?