Download Pop Quiz: Magnetism and Electricity

Pop Quiz: Magnetism and
Electricity
Joseph and Justin
Room 101
April 21, 2008
Question 1
 What is the stored source of electrical
energy?
A. Batteries
B. Fuse
C. Generator
D. Electric Motor
Answer 1
A. Batteries
 Definition: a battery is
a stored source of
electrical energy that
converts chemical
energy into electrical
energy
 A fuse is a safety
device in a circuit.
 A generator is a
device that converts
mechanical energy
into electrical energy.
 An electric motor
converts electric
energy to mechanical
energy.
Question 2
 What does not allow electrons to flow
freely?
A. Circuit breaker
B. Resistance
C. Insulator
D. Conductor
Answer 2
C. Insulator
 Definition: An
insulator does not
allow electrons to flow
freely.
 A resistance is the
amount of opposition
to the flow of
electricity.
 A circuit breaker is a
device that protects
the circuit from being
overloaded.
 A conductor allows
electrons to flow
freely.
Question 3
 What is used to measure the resistance
in a current?
A. Volt (voltage)
B. Amps (amperes)
C. Watts
D. Ohms
Answer 3
D. Ohms
 Definition: Ohms
measure the
resistance in a
current. The more
ohms, the more
resistance.
 Volts measure the
pressure of electrons.
 Amps measure the
battery’s current.
 Watts measure the
power (Volts x Amps=
Watts).
Question 4
 Where is the magnetic field strongest?
A. Compass
B. Magnetic field
C. Poles
D. Current
Answer 4
C. Poles
 Definition: Poles are
where the magnetic
fields are strongest
and magnets have
two, one north and
one south.
 A compass is used to
find the direction
“North”.
 A magnetic field is the
space around a
magnet where
magnetic forces
operate.
 A current is the
number of electrons
flowing per second.
Question 5
 What is the region inside a magnetic
material called?
A. Magnetic field
B. Domain
C. Magnetic poles
D. Magnetic force
Answer 5
B. Domain
 A magnetic field is a
magnetic force
 Definition: A domain is
around the area of a
the region inside a
magnet.
magnetic material.
 Magnetic poles are
used to attract other
steel/iron objects.
 Magnetic force is the
force exerted
between magnetic
poles, producing
magnetization.
Question 6
 What uses the Earth’s magnetic field?
A. Magnetite
B. Generator
C. Compass
D. Lodestone
Answer 6
C. Compass
 Definition: A compass
uses the Earth’s magnetic
field to find direction.
 Magnetite is a material
with magnetic properties.
 A generator is a device
that converts mechanical
energy into electrical
energy.
 Lodestone is a piece of
magnetite that has
magnetic properties and
attracts iron or steel.
Question 7
 What is the build-up of charges, the
stationary charges that do not move?
A. Static electricity
B. Parallel circuit
C. Series circuit
D. None of the above
Answer 7
A. Static electricity
 Definition: Static
electricity is the buildup of charges, the
stationary charges
that do not move.
 A parallel circuit has
different parts on
separate branches
and currents can flow
freely when there is a
malfunction in an
area.
 A series circuit is
connected on the
same branch and
can’t flow freely when
there is a malfunction
in an area.
Question 8
 What uses an electromagnet to convert
electrical energy to mechanical energy?
A. Switch
B. Electric motor
C. Generator
D. Compass
Answer 8
B. Electric motor
 Definition: A device
that uses an
electromagnet to
convert electric
energy to
mechanical energy
in order to do work.
 A switch is a device
that turns on/off a
circuit.
 A generator is the
exact opposite of an
electric motor.
 A compass uses the
Earth’s magnetic field
to find direction.
Question 9
 What is the push or pull between objects
with different charges?
A. Repel
B. Magnet
C. Attract
D. Electrical Forces
Answer 9
D. Electrical forces
 Definition: An
electrical force is the
pull or push between
objects with similar or
different charges.
 “Like” poles are used
to repel magnets.
 “Different” poles are
used to attract
magnets.
 A magnet is an object
that attracts/repels
objects with iron/steel
properties.
Question 10
 What kind of circuit doesn’t stop flowing if
one light bulb is destroyed?
A. Short circuit
B. Parallel circuit
C. Series circuit
D. Open circuit
Answer 10
B. Parallel Circuit
 Definition: Parallel circuits
are different parts on
separate branches.
Currents can flow evenly
when there is a
malfunction in one area.
 A short circuit is the
shortest path to the
ground. It occurs when
current follows a path
other than the intended
path. Sometimes this is
the least safe path.
 Series circuit are the
opposite of parallel
circuits.
 An open circuit has at
least one break so
current will not flow.
Question 11
 What is the measure of extra positive or
negative particles?
A. Volts
B. Watts
C. Kilowatt-hour
D. Charge
Answer 11
D. Charge
 Definition: A charge is
the measure of extra
positive or negative
particles on an object.
 Volts measure the
pressure on
electrons.
 Watts measure the
power of volts and
amps together.
 Kilowatt-hour is the
measure of the
electrical work done.
Question 12
 What can turn on and off a circuit?
A. Switch
B. Series circuit
C. Circuit breaker
D. Short
Answer 12
A. Switch
 Definition: A switch is
used to create an
opening in a circuit to
stop the flow of electricity,
or turn it on and off.
 A series circuit can not
turn on and off a circuit,
but it does have a circuit
that is all connected on
the same branch.
 A short causes electricity
to flow in the shortest
path.
 A circuit breaker is a
device that protects a
device from being
overloaded.
Question 13
 What kind of charge moves to make a
static charge?
A. Positive charge
B. Static electricity
C. Negative charge
D. Neutral charge
Answer 13
C. Negative charge
 Definition: A charge
that can move from
one object to another
when two opposite
objects are rubbed
against each other.
 A positive charge is a
charge that does not
move and waits for the
other negative charges
from the other object to
come over.
 Static Electricity is the
movement of electrical
charges from one object
to another that stay on
the object.
 A neutral charged object
has an equal number of
positive and negative
charges.
Question 14
 What device protects a circuit from being
overloaded?
A. Circuit breaker
B. Fuse
C. Generator
D. Electric motor
Answer 14
A. Circuit Breaker
 Definition: A device
that protects any
circuit from being
overloaded.
 A fuse is a safety
device in a circuit.
 A generator is a
device that converts
mechanical energy
into electrical energy.
 An electric motor
converts electric
energy to mechanical
energy.
Question 15
 How is Earth like a giant magnet?
A. Earth has a north and south magnetic
poles
B. Earth has a huge magnetic field.
C. Earth’s core is melted iron with electric
currents flowing in the liquid iron.
D. All of the above
Answer 15
D. All of the above
Earth has a north
and south magnetic
poles, and a huge
magnetic field.
Earth’s core is
melted iron with
electric currents
flowing in the liquid
iron.
 Earth is like a giant
bar magnet with a
north and south pole.
 Earth’s gigantic
magnetic field
surrounds the entire
planet.
 Earth’s core is melted
iron with electric
currents flowing in the
liquid iron.
Question 16
 What is the most important part of a
simple compass?
A. magnet
B. water
C. sponge
D. needle
Answer 16
A. Magnet
You need a magnet
to make a simple
compass. When
rubbed, the magnet
will make the needle
into a temporary
magnet that can
move freely to line
up with Earth’s
magnetic field.
 Water allows the
piece of sponge to
turn freely.
 A piece of sponge
provides a space for
the needle to rest.
 The needle will only
line up with Earth’s
magnetic field once it
is magnetized.
Question 17
 How are electric current and magnetic
fields related?
A. Electric current produces magnetic fields
B. Magnets in motion produce electricity
C. Oersted and Faraday were friends
D. Both A and B
Answer 17
D. Both A and B
Electric current
produces magnetic
fields, and magnets in
motion produce
electricity.
 In 1820, Hans
Christian Oersted
realized that the
flowing electric
charges caused a
magnetic field.
 In 1831, Michael
Faraday discovered
that moving a magnet
inside a wire coil
produced electric
current.
Question 18
 How can you make an electromagnet
stronger?
A. Use a thinner metal core
B. Remove the metal core
C. Add coils
D. Spread apart the coils further from one
another
Answer 18
C. Add coils
 An electromagnet will
be stronger if you add
more coils.
 A larger metal core
will make the
electromagnet
stronger.
 An iron core inside
the coil will make the
electromagnet
stronger.
 Close coils are
stronger than ones
spread apart from one
another.
Question 19
 What direction will a freely moving
magnet seek?
A. North
B. East
C. South
D. Towards the light
Answer 19
A. North
 Definition: The
direction a freely
moving magnet
seeks.
 South is another
direction with a
magnet that is free
does not seek.
 East is another
direction which a
freely moving magnet
does not seek.
 Towards the light is
the direction dead
people follow.
Question 20
 How are electromagnets used in
everyday life?
A. In earphones
B. In doorbells
C. In motors
D. All of the above
Answer 20
D. All of the above
 Electromagnets in
Electromagnets can convert
earphones change electrical
electrical energy to other
energy into motion and
forms of energy.
sound.
Electromagnets also work with
 The electromagnet in a
permanent magnets and wire
doorbell transforms
coils to produce motion in
electricity into motion by
motors and generators. The
pulling up the contact arm.
poles of the permanent
This makes the clapper hit
magnet attract and repel the
the bell, making sound
poles of the magnetic field.
vibrations.
 The electromagnet in a
motor uses electric current
to create a magnetic field.
The magnetic field near the
rotor attracts and repels the
rotor.
Results
All 20- Thomas Edison
15-20- Benjamin
Franklin
12-15- Magnetism Geek
10-12- Straight A
Student
5-10- Need More
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