# Shared Flashcard Set

## Details

Chapter 37: Electromagnetic Induction Questions
Chapter 37 Electromagnetic Induction Questions
12
Physics
01/15/2012

Term
 A lot or a little. If you move a magnet quickly through a lot of coiled wire, you produce ______ _______ of voltage.
Definition
 a lot
Term
 A lot or a little. If you move a magnet slowly through coiled wire you produce ____ ___________ voltage.
Definition
 a little
Term
 What did Faraday and Henry discover?
Definition
 Electric current could be produced in a wire by moving a magnet in or out of a wire coil.
Term
 More or less. It takes _________ work or effort to push a magnet quickly through several coils of wire than to push it slowly through a small number of coils of wire.
Definition
 more
Term
 Name a machine that produces electric current by rotating a coil within a stationary magnetic field.
Definition
 Generator
Term
 An electric motor converts _________________ energy into _________________ energy.
Definition
 electricalmechanical
Term
 A generator converts ______________________ energy into ____________________ energy.
Definition
 mechanicalelectrical
Term
Definition
 Voltage in a coil: ↑loops, ↑rate of field changes, ↑voltage induced. Voltage in a coil: ↓loops, ↓rate of field changes, ↓ voltage induced.
Term
 A device for increasing or decreasing voltage through electromagnetic induction.
Definition
 Transformer
Term
 State the Transformer equation.
Definition
 (Primary voltage/# primary turns) = (Secondary voltage/#secondary turns)
Term
 In a step-up transformer, is conservation of energy true?
Definition
 Yes. Power into Primary = Power out of secondaryP=PVI=VIVI=2V(1/2I)
Term
 What happens at the critical speed for an electromagnetic wave?
Definition
 If electric charges are set into motion at a critical speed, the magnetic field induced re-induces the electric field. The electric and magnetic fields continually regenerate each other.
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