Physics Principles and Problems 2009

Section 25.1 : Electric Current from Changing Magnetic Fields

Self-Check Quizzes

1
How can current be induced in a wire by a magnetic field?
A)by wrapping the wire around a strong magnet
B)by connecting the wire to a galvanometer
C)by moving the wire through the field
D)by holding the wire perpendicular to the field
2
Why is the term electromotive force misleading?
A)because there is no electricity involved
B)because it describes a potential difference, not a force
C)because it has two meanings
D)because it is the same thing as electromagnetic induction
3
What energy conversion takes place in a generator?
A)electromagnetic energy to electrical energy
B)mechanical energy to electrical energy
C)electrical energy to mechanical energy
D)potential energy to kinetic energy
4
What energy conversion takes place in a motor?
A)thermal energy to electrical energy
B)mechanical energy to electrical energy
C)electrical energy to mechanical energy
D)electromagnetic energy to electrical energy
5
Why is power in an AC generator given as average power?
A)because specific values cannot be determined
B)because the power increases over time
C)because the power decreases over time
D)because the current and voltage vary
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