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Worksheets

HPS Unit 11

Total questions: 74

Worksheet time: 3hrs 3mins

Name
Class
Date
1.
The picture shows an electrical circuit. This circuit is a series circuit because: 
a)
It has 3 light bulbs.
b)
The same current flows through all three light bulbs.
c)
It uses a single battery.
d)
The electrical current is divided between the three light bulbs.
2.
What is the total resistance (RT) across this circuit?
a)
3 kΩ
b)
10 kΩ
c)
13 kΩ
d)
16 kΩ
3.
As resistors are added in series to a circuit, the total resistance will...
a)
increase
b)
decrease
c)
stay the same
4.
What is a switch's function in a circuit?
a)
to make the current hotter or colder
b)
turn on and off the flow of current
c)
the pathway that current flows
d)
to add more power to the circuit
5.
this circuit is .....?
a)
open
b)
parallel
c)
closed
d)
The cutest little circuit evah!
6.
When all parts of the circuit are connected it is a ______ circuit. 
a)
open
b)
closed
7.
When you flip a light switch on and off you are closing and opening a circuit.
a)
true
b)
false
8.
An object through which electrons can easily flow is called a(n) ___________.
a)
Conductor
b)
Insulator
9.
What is a common energy source for a circuit?
a)
Light bulb
b)
Battery
c)
Wire
d)
Switch
10.

How many lightbulbs will work if there is a break in the circuit at POINT A?

a)

1

b)

2

c)

3

d)

NONE

11.

The current going through the 90 ohm resistor is

a)

10 amps

b)

0.1 amps

c)

0.2 amps

12.
this is the symbol for a _____?
a)
switch
b)
light 
c)
battery
d)
wires
13.

Why is electrical wiring usually made from copper?

a)

Because copper is shiny

b)

Because copper conducts electricity

c)

Because copper is not magnetic

d)

Because copper insulate electricity

14.

Why is electrical wiring usually are covered with a layer of plastic?

a)

To make it look pretty

b)

To help electricity flow along the wire

c)

To make it safe

d)

To add more energy

15.

What is a circuit that only has ONE path for electricity to flow?

a)

series circuit

b)

closed circuit

c)

parallel circuit

d)

light bulb

16.

What is a circuit with several paths for electricity to flow?

a)

conductor

b)

series circuit

c)

parallel circuit

d)

open circuit

17.
This circuit has a battery, buzzer, and switch.
When the switch is closed the buzzer will sound because -
a)
the switch gives energy to the battery
b)
the buzzer is made of special plastic
c)
the wires are cooled by the surrounding air
d)
electricity can flow in a complete path
18.
Which bulbs will light?
a)
1 and 2
b)
2 and 3
c)
3 and 4
d)
4 and 2
19.
Will the light bulb in this circuit light and why/why not?
a)
yes, because it has two batteries
b)
no, because the switch is open
c)
yes, because it is in a circuit
d)
no, because the bulb is burned out
20.

What unit is used to measure current?

a)

Ohms

b)

Omega

c)

Volts

d)

Amps

21.

What unit is used to measure resistance?

a)

Ohms

b)

Omega

c)

Volts

d)

Amps

22.

What is the current in a circuit with 6 ohms of resistance and a battery containing 24 Volts?

a)

1/4 A

b)

144 A

c)

4 A

d)

0.4 A

23.

What is the resistance of a lightbulb that experiences 9 Volts and 3 amps of current?

a)

1/3 ohms

b)

3 ohms

c)

27 ohms

d)

9 ohms

24.

What is the voltage of a circuit with 4 ohms of resistance and 3 amps of current?

a)

12 V

b)

21 V

c)

4/3 V

d)

3/4 V

25.
What size resistor would produce a 3 Amp current flow with a 12 Volt battery
a)
1 Ohm
b)
3 Ohms
c)
4 Ohms
d)
12 Ohms
26.
What is Resistance?
a)
The flow of electrons
b)
Electric potential difference
c)
A battery
d)
The ability to reduce the flow of electrons
27.

Electricity that flows in a closed path is called a

a)

path

b)

current

c)

circuit

d)

light

28.
What is the Voltage of a circuit that has a resistance of 5 Ω and a current of 2 A?
a)
25 V
b)
10 V
c)
2.5 V
d)
0.4 V
29.
The mathematical relationship among Voltage, Current, and Resistance
a)
Faraday's Law
b)
Tesla's Law
c)
Edison's Law
d)
Ohm's Law
30.

What is the formula for ohms law?

a)

1+2=3

b)

R X E = I

c)

V =I x R

d)

E= MC squared

31.
How do you calculate voltage?
a)
Current X Resistance
b)
Resistance ÷ Current
c)
Current ÷ Resistance
d)
Measure it with a ruler
32.
What voltage is needed to cause a 2A current flow through a 10Ω resistor?
a)
5V
b)
0.2V
c)
20V
d)
200V
33.
What resistance is needed to cause a 50A current flow because of a 500V battery?
a)
10Ώ
b)
5Ώ
c)
2500Ώ
d)
550Ώ
34.
With the engine running the charging system produces 14.5 Volts what would the current flow be if a resistance of 6 Ohms was present
a)
2.41 Ohms
b)
2.52 Ohms
c)
2.1 Ohms
d)
0.3333 Ohms
35.
The mathematical relationship among Voltage, Current, and Resistance
a)
Faraday's Law
b)
Tesla's Law
c)
Edison's Law
d)
Ohm's Law
36.
To complete a circuit the switch must be
a)
unattached
b)
open
c)
closed
d)
It depends
37.
The flow of electricity requires a
a)
complete path
b)
incomplete path
c)
insulated current
d)
complex circuit
38.
What is this symbol?
a)
resistor
b)
switch
c)
battery
d)
bulb
39.
This circuit has a 24 volt battery and the resistor is 8 ohms. How many amps are running through the circuit?
a)
3 Amps
b)
192 Amps
c)
2 Amps
d)
4 Amps
40.

The force or push that causes electric charges to move is called ______.

a)

resistance

b)

voltage difference

c)

current

d)

static electricity

41.

Electrons move towards _____________, but electrical current always flow from _____ areas to _____ areas.

a)

positive, positive, negative

b)

positive, negative, positive

c)

negative, positive, neutral

d)

negative, neutral, negative

42.

. A material through which electrons do NOT flow easily is a(n) _____.

a)

insulator

b)

fuse

c)

conductor

d)

circuit breaker

43.
The magnet's shown will
a)
not move
b)
attract
c)
repel
d)
all of the above
44.
The magnet's shown will
a)
not move
b)
attract
c)
repel
d)
all of the above
45.
Magnets attract things made of
a)
copper
b)
iron
c)
wood
d)
plastic
46.
All magnets have 2
a)
fields
b)
colors
c)
poles
d)
all of the above
47.
Iron, Nickel and cobalt are all __________________ materials
a)
Shiny
b)
poles
c)
magnetic
d)
cold
48.
Where is the strongest attraction force of the magnet?
a)
at the poles
b)
in the middle
c)
above the magnet
d)
below the magnet
49.
Which of the following is true about a bar magnet?
a)
Its magnetic field is strongest near its center.
b)
It is surrounded by a magnetic field.
c)
The north pole is stronger than the south pole.
d)
The south pole is stronger than the north pole.
50.
The space around a magnet where the force of a magnet can attract best is called__________
a)
magnetism
b)
bar magnet
c)
horseshoe magnet
d)
magnetic field
51.
What kind of magnet can be turned on and off?
a)
refridgerator magnet
b)
electromagnet
c)
magnetite
d)
iron
52.
How is a permanent magnet DIFFERENT from a temporary magnet?
a)
A permanent magnet attracts materials made of iron.
b)
A permanent magnet has poles.
c)
A permanent magnet has a magnetic field.
d)
A permanent magnet keeps its magnetism for a long time.
53.
Why does a compass needle point north?
a)
The compass is a bar magnet
b)
Because north is up
c)
Because it's magic
d)
It lines up with the Earth's magnetic field
54.
Generators are devices that convert _____ energy into _____ energy.
a)
chemical; mechanical
b)
mechanical; electrical
c)
electrical; mechanical
d)
potential; kinetic
55.

In a _______ a spinning turbine moves magnets which generates an electric current.

a)

Motor

b)

Generator

56.

What is the transfer of energy in when you plug in a motor and it spins?

a)

chemical to mechanical

b)

electrical to mechanical

c)

mechanical to electrical

d)

physical to potential

57.
What type of energy comes OUT of a generator?
a)
Mechanical
b)
Electrical
c)
Thermal
d)
Potential
58.
In an electric motor, the energy transformation begins as  ----
a)
electrical and becomes chemical
b)
mechanical and becomes electrical
c)
electrical and becomes mechanical
d)
mechanical and becomes chemical
59.

Are the magnetic field lines in the picture correct?

a)

Yes, because they point from north to south.

b)

No, because they point from north to south (they're supposed to go the other way).

c)

Yes, because the North pole is on the left in all pictures.

d)

No, because the North pole is on the left in all pictures (it's supposed to be on the right).

60.
A north pole and a south pole will attract.
a)
True
b)
False
61.
What happens when two north poles of a magnet are placed together?
a)
they repel
b)
they attract
c)
they cancel each other out
d)
the strength of the magnet is doubled
62.

The area of magnetic force around a magnet is known as its _____________.

a)

magnetic field

b)

magnetic declination

c)

magnetic fan lines

d)

magnetic tan lines

63.

A ________ is a device that has a magnet on a needle that spins freely. It is used for navigation because its needle usually points north.

a)

calculator

b)

ruler

c)

compass

d)

map

64.
In this image, matching north poles from two magnets are introduced.  What do you predict will be the outcome?
a)
There will be no interaction.  The poles of magnets do not have an effect on one another.
b)
The two north poles will attract each other
c)
The two north poles will repel each other
d)
The two magnets will combine and become one magnet
65.

Looking at the field lines in this picture, these two magnets are ________

a)

Attracting

b)

Repelling

c)

Attracting and Repelling

d)

Doing nothing

66.
How are electromagnets different from magnets?
a)
magnets can be turned on/off
b)
you can turn an electromagnet on/off
c)
magnets are more powerful
d)
magnets have a North and South pole
67.
The force of magnetism is stronger when magnets are ________________
a)
cold
b)
round
c)
closer together
d)
farther apart
68.
Every electrical current has a circular magnetic field around it.
a)
True
b)
False
69.
If the electrical current decreases, then the magnetic field decreases.
a)
True
b)
False
70.
Magnetism is a type of ____________
a)
force
b)
book
c)
plant
d)
animal
71.

Why is an electromagnet classified as a temporary magnet?

a)

It is only a magnet when the current is flowing

b)

It is only a magnet when the force is strong

72.

In what direction would force act on a current carrying wire.

a)

perpendicular

b)

Parallel

c)

always upwards

d)

Opposite the geographic north pole.

73.

What happens if a magnet is moved through a wire loop?

a)

An electrical current is induced in the wire.

b)

A magnetic field is cancelled by the wire.

c)

A magnetic current is created in the permanent magnet

d)

All are correct answers.

74.

In front of you is a vertical wire, with a current running from bottom to top. If you placed a compass 90 degrees to the left side of the wire where would the needle point?

a)

Towards you

b)

to your right

c)

To your left

d)

Away from you

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