Assignments
Due Date
Lab: The Electromagnet
Lab: The Electric Motor
Lab: Induction
Questions 3, 6, 9, 12, 16 p 514
Problems 1-4 p 514
Problems 1, 3, 4, 6, 8 p 523
Homework Help
Induction Study Guide
For the test over induction you should know:
How to figure equivalent inductances of inductors in series and parallel
How to use the right-hand motor rule and left-hand generator rule to figure directions of currents or forces in magnetic fields
When induction will occur.
What effect is the basis for the operation of a motor? Of a generator?
What does Lenz's law say about direction of induced current?
What type of energy conversions are taking place in motors and generators?
When is back emf at a maximum? minimum?
What is the coil position when maximum current is generated in a generator? maximum torque in a motor?
What is the function of the commutator in a dc motor or generator?
The meaning of commutator, stator, rotor, magneto, exciter, alternator, universal motor, induction motor, synchronous motor
And be able to solve problems involving:
The self inductance of a coil
The mutual inductance between two coils
The induced emf in a wire moving at constant speed through a magnetic field
The secondary voltages, number of turns, and/or currents in a transformer
The efficiency of a transformer
The unknown parameters of a generator circuit, such as currents, potential differences, emf, etc., and draw the circuit diagram
The directions of induced currents using Lenz's law.
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