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