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Electricity, Magnetism, And Motion Part 2
Test Description: This is continuing the review from Chapter 3 in the Electricity and Magnetism text by Pearson Publishing.
Instructions: Answer all questions to get your test result.
1) When a wire with a current is placed in a magnetic field,
A
the wire becomes a permanent magnet.
B
mechanical energy is transformed into electrical energy.
C
the current stops.
D
electrical energy is transformed into mechanical energy.
2) To reverse the direction of current in a motor, current is conducted
A
through the commutator to the armature.
B
through the armature.
C
in the direction of rotation.
D
through the brushes to the commutator.
3) The type of current produced by a battery is
A
alternating current.
B
magnetic current.
C
direct current.
D
induced current.
4) A generator transforms
A
potential energy into kinetic energy.
B
magnetic energy into electrical energy.
C
mechanical energy into electrical energy.
D
friction into electrical energy.
5) What is produced when there is a current in the primary coil of a transformer?
A
electric field
B
magnetic field
C
solar field
D
nuclear field
6) A device used to measure small currents is a(n)
A
electric motor.
B
commutator.
C
armature.
D
galvanometer.
7) A device that supplies the mechanical energy to turn the armature of a generator is a
A
brush.
B
magnet.
C
slip ring.
D
turbine.
8) You can increase the strength of an electromagnet’s field by
A
using a stronger ferromagnetic material for the core.
B
winding the coils more loosely.
C
decreasing the current in the solenoid.
D
decreasing the number of loops in the solenoid.
9) A coil of wire with a current is called a(n)
A
galvanometer.
B
insulator.
C
solenoid.
D
electromagnet.
10) An electric current produces a(n)
A
solenoid.
B
magnet.
C
magnetic field.
D
insulator.
11) Which is NOT a characteristic of a magnetic field produced by a current?
A
Its speed can be slowed.
B
Its direction can be reversed.
C
Its strength can be changed.
D
It can be turned on and off.
12) The ability to move an object over a distance is called
A
energy.
B
electricity.
C
electromagnetism.
D
magnetism.
13) What device transforms electrical energy into mechanical energy?
A
an electric motor
B
an electromagnet
C
a generator
D
a solenoid
14) In an electric motor, a commutator
A
is a magnet.
B
repeatedly reverses the flow of current through the armature.
C
is made out of dozens of wire loops wrapped around a ferromagnetic core.
D
is directly connected to the current source.
15) What device increases voltage?
A
step-down transformer
B
generator
C
step-up transformer
D
motor
*select an answer for all questions
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