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