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Total questions: 144

Worksheet time: 3hrs 7mins

Name
Class
Date
1.
A balloon is rubbed all over with wool.  The balloon will now attract wool because the balloon and wool
a)
are magnets
b)
have opposite charges
c)
have like charges
d)
have neutral charges
2.
Will this circuit light the bulb? 
a)
Yes
b)
No
3.

This device converts mechanical energy into electrical energy. It creates electricity.

a)

Electric Generator

b)

Electric Motor

c)

Electromagnet

d)

Voltmeter

4.
Bob made an electromagnet but it was very weak.  How can he make it stronger?
a)
take away a d-cell
b)
wrap the wire loosely
c)
use thicker wire
d)
use less winds
5.

The strength of an electromagnet can be affected by

a)

changing the current in the wire

b)

adding more coils

c)

increasing the mass of the iron core

d)

All of the above

6.
This is a picture of a simple electromagnet. How can the electromagnet be made stronger?
a)
Add more coils of wire to the nail.
b)
Use a smaller battery.
c)
Reverse the poles of the magnet.
d)
Remove all the coils and the nail.
7.
How do electromagnets differ from regular magnets? 
a)
A. They  can be turned off and on 
b)
B. Their polarity can be reversed
c)
C. Their strength can be changed
d)
D. All of the above
8.
Where does a magnetic field occur in relation to an electrified wire? 
a)
At either end, but not in the middle
b)
Only the side closest to source
c)
Around the entire length of wire
d)
Only the side furthest from source
9.
Surrounding every magnet is a __________  __________.
a)
magnetic field
b)
electrical current
c)
another magnet
d)
an enemy
10.
A motor will make electrical energy change into 
a)
motion energy
b)
chemical energy
c)
mechanical energy
d)
nothing
11.
In large generators in power plants, ___________ rotate inside a coil of wire to produce an electric current.
a)
Wind
b)
Water
c)
Magnets
d)
Circuits
12.
What two forces are required for generators and electric motors to work? 
a)
magnetism and thermal 
b)
electricity and thermal 
c)
electricity and magnetism 
d)
magnetism and radiant 
13.

What word best fits this definition: A device which converts electrical energy into mechanical energy usually through the rotation of an electromagnet in the field of a stationary magnet.

a)

armature

b)

system

c)

motor

d)

electromagnet

14.
Electricity is the flow of _________.
a)
Protons
b)
Neutrons
c)
Electrons
15.
Generators are devices that convert _____ energy into _____ energy.
a)
chemical; mechanical
b)
mechanical; electrical
c)
electrical; mechanical
d)
potential; kinetic
16.

Moving magnets generate_______________ (select two)

a)

moving electrons

b)

mechanical energy

c)

electric current

d)

chemical energy

17.

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

a)

Motor

b)

Generator

18.

What does a motor do?

a)

Moves up and down

b)

Rotates without electricity

c)

It induces electricity

d)

Uses electricity to rotate

19.

How are electromagnets different from magnets? (select two)

a)

magnets can be turned on/off

b)

you can turn an electromagnet on/off

c)

electromagnets are temporary

d)

magnets are more powerful

20.
How do you increase the strength of an electromagnet?
a)
Decrease the number of batteries and increase the number of coils
b)
Increase the electric current and decrease the batteries
c)
You cannot strengthen an electromagnet
d)
Increase the electric current and increase the number of coils
21.
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
22.
What is current measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
23.
What is current measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
24.
What is Resistance?
a)
The flow of electrons
b)
Electric potential difference
c)
A battery
d)
The ability to reduce the flow of electrons
25.
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
26.
Current times Resistance equals
 (I X R)
a)
Power
b)
Voltage
c)
Amperage
d)
Ohm
27.

Voltage divided by Resistance

(V / R)

a)

Current

b)

Power

c)

Ohms

d)

Watts

28.
How many Volts would it take to push 1 Amp through a resistance of 1 Ohm
a)
10 volts
b)
1 volt
c)
48 volts
d)
5 volts
29.
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
30.
What would the circuit resistance be if a 7.5 Amp draw was present with the engine running and the charging system producing 15 Volts
a)
15 Ohms
b)
4 Ohms
c)
0.3333 Ohms
d)
2 Ohms
31.
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
32.
What voltage is needed to cause a 5A current flow through a 2Ω resistor?
a)
10V
b)
2.5V
c)
7V
d)
0.4V
33.
What voltage is needed to cause a 50A current flow through a 10Ω resistor?
a)
15V
b)
500V
c)
500 kV
d)
0.2V
34.
What resistance is needed to cause a 50A current flow because of a 500V battery?
a)
10Ώ
b)
5Ώ
c)
2500Ώ
d)
550Ώ
35.
What resistance is needed to cause a 20A current flow because of a 100V battery?
a)
0.2Ώ
b)
2000Ώ
c)
120Ώ
d)
5Ώ
36.
If the battery produced 12.6 Volts and what would be the current flow be for a 6 Ohm resistor
a)
2.1 Amps
b)
2.4 Amps
c)
1.71 Amps
d)
15 Amps
37.
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
38.
What is resistance measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
39.

What is the current of a series circuit with a total resistance of 10 ohms and a voltage of 110 V

a)

0.09

b)

11.0

c)

1100.0

d)

10.0

40.
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
41.
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
42.
How many Volts would we need to produce a current flow of 8 Amps through a 6 Ohm resistor
a)
12 volts
b)
24 volts
c)
1.3333
d)
48 volts
43.
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
44.

How much resistance is required to create 19 A with a 120 V source?

a)

63.2 Ω

b)

6.32 Ω

c)

6.32 W

d)

632 Ω

45.

How much voltage is required to create 900 W on a circuit pulling 4 A?

a)

2.25 V

b)

22.5 V

c)

225 V

d)

225 Ω

46.

If the battery produced 12.6 Volts and there was a 6 Ohm resistor, what would be the current?

a)

2.1 Amps

b)

2.4 Amps

c)

1.71 Amps

d)

15 Amps

47.
What voltage is needed to cause a 2A current flow through a 10Ω resistor?
a)
5V
b)
0.2V
c)
20V
d)
200V
48.
What resistance is needed to cause a 50A current flow because of a 500V battery?
a)
10Ώ
b)
5Ώ
c)
2500Ώ
d)
550Ώ
49.

If there are 40 Volts and 5 Amps running through an electrical circuit, what is the resistance of the circuit?

a)

1 Ohm

b)

2 Ohms

c)

4 Ohms

d)

6 Ohms

e)

8 Ohms

50.

If an electric ceramic brush has a current of 0.3 amps and a voltage of 120 volts, what is the resistance?

a)

18Ω

b)

36Ω

c)

200Ω

d)

400Ω

51.

If a charger for a tablet offers a voltage of 120V and has 240Ω of resistance, what is the amperage?

a)

0.5A

b)

2A

c)

14,400A

d)

28,800A

52.

If a computer has 10.0A of current and 11Ω of resistance, what is its voltage?

a)

0.9V

b)

1.1V

c)

55V

d)

110V

53.

If the Voltage stays the same and Resistance is increased, Current will

a)

Increase

b)

Decrease

c)

Stay the same

d)

none of these

54.

If the Voltage is increased and the resistance stays the same, Current will

a)

Increase

b)

Decrease

c)

Stay the same

d)

none of these

55.

When only one lightbulb blows out, an entire string of decorative lights goes out. The lights in this string must be connected in

a)

series with multiple current pathways

b)

series with one current pathway

c)

parallel with multiple current pathways

d)

parallel with one current pathway

56.
This circuit does not work because…
a)
the bulbs are not connected properly
b)
two cells are not powerful enough
c)
there is a break in the circuit
d)
the cells are facing each other
57.
This circuit does not work because…
a)
the bulbs are not connected properly
b)
the single cell is not powerful enough
c)
there is a break in the circuit
d)
there is a short crcuit
58.
In a parallel circuit, if one connection is broken, all of the connections stop working.
a)
True
b)
False
59.
A series circuit has ____ path(s) that the electric current can take. 
a)
One
b)
Two 
c)
Three 
d)
Four
60.
This circuit has more than one loop. When one light goes out, the others stay on. 
a)
closed circuit
b)
series circuit
c)
parallel circuit
d)
open circuit
61.
In a parallel circuit if one of the light bulbs burns out the rest _________.
a)
stop the flow of electricity
b)
 can still light up
c)
 will go out
d)
of the light bulbs burn out also
62.
Does this statement best describe a parallel or a series circuit.
 
When more light bulbs are added they all remain bright. 
a)
Parallel circuit
b)
Series circuit
63.
A class prepared some electrical circuits using battery, connecting wires, and three light bulbs.  Which of these circuits can make the three bulbs light?
a)
A
b)
B
c)
C
d)
D
64.

Choose the correct option to describe the current readings shown by the ammeter in this circuit

a)

A2 = A3

b)

A2 + A3 = A1

c)

A1 + A2 = A3

d)

A4 = A2 - A3

65.

In a series circuit...

a)

the current is the same everywhere.

b)

the current is split between components.

c)

the voltage is the same everywhere.

d)

the voltage is split between components.

66.

What is the missing value on the voltmeter?

(a)  

67.

Electricity is the presence of movement of _______ .

a)

Neutrons

b)

Protons

c)

Electrons

d)

Nucleus

68.

What is an electric circuit?

a)

The path which the electric current takes.

b)

The movement or flow of negatively charged electrons

c)

The presence of electrons

d)

An electric charge that collects or builds up on the surface of an object

69.

Which one of this that are NOT basic component of simple circuit?

a)

Light bulb

b)

Wire

c)

Battery

d)

Appliances

70.

In series circuit, there is only _____ path for electrons to flow.

a)

One

b)

Two

c)

Three

d)

Four

71.

In series circuit, the lights are connected ________ to each other.

a)

Side by side

b)

Parallel

c)

Close by

d)

Effectively

72.

If one of the light bulb in series circuit is taken off, what will happen to the other light bulb?

a)

The other light bulb will be on

b)

The other light bulb will be off

c)

The other light bulb will stay on

d)

Both light bulb will be on

73.

In parallel circuit, there are _________ pathways for charge to flow.

a)

One

b)

Two or more

c)

None

d)

Zero

74.

In a parallel circuit, if we remove one of the light bulb, what will happen to the other light bulb?

a)

The other light bulb will stay on.

b)

The other light bulb will be off

c)

Both light bulb will be on

d)

Both light bulb will be off

75.

If we add more light bulbs into a parallel circuit, how will the brightness of the bulbs change?

a)

It will get dimmer

b)

It will get brighter

c)

The brightness will stay the same

d)

None of the light bulb will be on

76.

Which one is the circuit diagram of this picture?

a)
b)
c)
d)
77.

What is the advantage of having a safety switch or fuse in the electric circuits of your house?

a)

Safety switches break the circuit when there is no fault

b)

Safety switches switch the electrical current

c)

It prevents the circuit from overheating and starting the fire

d)

Fuses are fused together with electrical wires

78.
What is a series circuit?
a)
The transfer of electrons from one object to another
b)
A circuit with a single path the current follows
c)
A circuit that goes in multiple directions
d)
A circuit that takes place in a series of events
79.
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 has more than one path to flow through
80.

Which of these would best complete the circuit so the lightbulb turns on?

a)

rubber band

b)

metal nail

c)

leather shoelace

d)

wooden toothpick

81.
Pick the correct sentence.
a)
This circuit will work because it is a closed circuit.
b)
Energy will freely flow in this circuit.
c)
This circuit will not work because there is no energy source.
d)
This circuit will not work because there is no switch.
82.
This type of circuit only has one path for current to flow. 
a)
series
b)
parallel
c)
combination
d)
split
83.
A material in which electrons are not able to move easily 
a)
Circuit 
b)
Insulator 
c)
Resistance 
d)
Conductor
84.
A material in which electrons are able to move easily
a)
Circuit
b)
Insulator 
c)
Resistance 
d)
Conductor 
85.
What is a current?
a)
A constant flow of electricity 
b)
A path that a current can flow along
86.
What is a circuit?
a)
A constant flow of electricity 
b)
A path that a current can flow along
87.

What type of circuit is shown?

a)

Parallel

b)

Series

c)

Open

88.

The voltage stays the same in a series circuit.

a)

True

b)

False

89.
This is an example of a _______ circuit
a)
open
b)
series
c)
parallel
d)
square
90.
This is an example of a ______ circuit
a)
Series
b)
Parallel
c)
Open
d)
Dihexihedral
91.
What kind of circuit is this?
a)
Series
b)
Consecutive
c)
Parallel
d)
Training
92.
What kind of circuit is this?
a)
Series
b)
Consecutive
c)
Parallel
d)
Training
93.
What will happen if one light bulb is removed from this circuit?
a)
The other bulbs will go out.
b)
The other bulbs will stay on
c)
The other bulbs will get dimmer.
d)
The battery will become stronger.
94.

What is happening here?

a)

Series circuit - Bulbs are lit

b)

Series circuit - Bulbs are off

c)

Parallel circuit - Bulbs are lit

d)

Parallel circuit - Bulbs are off

95.

What connects the current source with the commutator of a motor.

a)

brushes

b)

armature

c)

magnet

d)

commutator

96.

The rotating part of an electrical motor.

a)

brushes

b)

magnet

c)

commutator

d)

armature

97.

Any material that attracts iron and materials that contain iron.

a)

armature

b)

brushes

c)

magnet

d)

electric motor

98.

A device that controls the direction of the flow of current through an electric motor

a)

electromagnet

b)

Electromagnetism

c)

solenoid

d)

commutator

99.

A coil of wire that produces a magnetic field when carrying an electric current

a)

electromagnet

b)

solenoid

c)

galvanometer

d)

commutator

100.

a coil that has a soft iron core and that acts as a magnet when an electric current is in the coil

a)

electromagnet

b)

solenoid

c)

transformer

d)

motor

101.

A device that uses an electromagnet to detect small amounts of current

a)

brushes

b)

solenoid

c)

galvanometer

d)

transformer

102.

Device that uses electromagnetic induction to change the voltage of electric current.

a)

thermometer

b)

galvanometer

c)

electric transformer

d)

electric motor

103.

A device that decreases the voltage of an alternating current is called a(n)

a)

step down transformer

b)

step up transformer

c)

compass

d)

solenoid

104.

The number of loops in the primary and secondary coils is 100 and 350 respectively. The primary voltage is 200V. What is the voltage in the secondary coil?

a)

400 V

b)

500 V

c)

600 V

d)

700 V

105.

The primary coil of a transformer has 10 loops and 1,200V. The secondary coil has a voltage of 2,400 V, what is the number of loops in this coil?

a)

2

b)

20

c)

10

d)

25

106.

A flow of positive and negative charges is called:

a)

Neurons

b)

Electricity

c)

Transformers

d)

Turbines

107.

This is an example of a:

a)

substation

b)

grid

c)

transformer

d)

solar panel

108.

Transformers like this step the voltage ________ before it reaches your home to make it more __________.

a)

up; safe

b)

down; unsafe

c)

up; unsafe

d)

down; safe

109.

Which BEST describes this image?

a)

A network of systems that generate, transmit, and distribute electricity.

b)

The path electricity follows.

c)

The loosely connected US electric grid system.

d)

The movement of electricity from the power plant to your home.

110.

Solar, wind, and water are examples of:

a)

nonrenewable resources

b)

exploited resources

c)

renewable resources

d)

old resources

111.

Nonrenewable resources:

a)

are limited and cannot be replaced quickly.

b)

are unlimited and abundant.

c)

are always replenishing themselves (like solar, wind, and water).

d)

will never run out and generate no CO2.

112.

This is a:

a)

motor

b)

rotor

c)

turbine

d)

spinner

113.

A system of transformers is called a(n):

a)

weather station

b)

panel station

c)

electric station

d)

substation

114.

Which of these components make up the electric grid system (choose all that apply)?

a)
b)
c)
d)
115.

Because the sun constantly generates solar energy, it is considered:

a)

renewable

b)

nonrenewable

c)

a fossil fuel

d)

a CO2 generator

116.

State the energy change involved in power station that uses wind energy

(a)  

117.

Select the two factors that produces electric current found by Michael Faraday

a)

Movement of the galvanometer

b)

Movement of the magnet

c)

Movement of the wire

118.

What is the meaning of direct current?

(a)  

119.

Alternating current flows _____ and at ______ magnitude

a)

in one direction, fixed

b)

alternately, fixed

c)

in one direction, changing

d)

alternately, changing

120.

Arrange the energy change involved in generators using biomass :

_____ -->_____ -->_____ -->_____

a)

Heat energy, kinetic energy, chemical energy, electrical energy

b)

chemical energy, heat energy, electrical energy, kinetic energy

c)

kinetic energy, heat energy, electrical energy, chemical energy

d)

chemical energy, heat energy, kinetic energy, electrical energy

121.

How is Electricity Generated?

a)

By the use of turbines

b)

by the use of electricity

c)

by the use of sub stations

d)

by the use of transmission lines

122.

Which of the following is utilize to generate electricity in a hydro electric power plant?

a)

Nuclear

b)

Water

c)

coal

d)

Fossil Fuel

123.

How do Solar power plant produce electricity?

a)

the sunlight turns the turbines

b)

the solar panels collect the lights coming from the sun.

c)

the steam from the sunlight rotates the turbines

d)

it doesn't happen at all.

124.

Which type of fuel is a solid?

a)

oil

b)

coal

c)

natural gas

d)

solar

125.

Why is ethanol a renewable fuel?

a)

It is made from algae.

b)

It is made from corn.

c)

It is made from coal.

d)

It is a fossil fuel.

126.

Fossil fuels are sources of energy made from what?

a)

prehistoric plants

b)

prehistoric animals

c)

both of these

d)

none of these

127.

Figure shows two pulses on a CRO. The pulses are caused by two consecutive signals detected by a microphone connected to the CRO.


Calculate the time lapse between the signals if the timebase setting is 4 ms cm -1.

a)

1.208 second

b)

0.1208 second

c)

0.00208 second

d)

0.0208 second

128.

Diagram shows a waveform displayed on the screen of a cathode ray oscilloscope (C.R.O.). Which of the following control switch needs to be switched on to display this waveform?

a)

intensity

b)

time-base

c)

Y-gain

d)

Y-shift

129.

Diagram shows a trace on the screen of a C.R.O. when a signal is connected across the Y-input. What type of signal is applied across the Y-input and what is the condition of the time-base?

a)

alternating current, switched off

b)

direct current, switched off

c)

alternating current, switched on

d)

direct current, switched on

130.

Diagram shows the trace displayed on the screen of a C.R.O. with the time-base set to 10 ms/div. What is the frequency, f of the wave?

a)

5 Hz

b)

25 Hz

c)

40 Hz

d)

50 Hz

131.

Diagram shows a waveform displayed on the screen of a C.R.O. If the controls on the C.R.O. are set at 0.5 V/div and 2 ms/div, find the peak voltage and the frequency of the input signal.

a)

4 V, 2 Hz

b)

5 V, 10 Hz

c)

2 V, 100 Hz

d)

4 V, 100 Hz

132.

If a transformer reduces voltage, it is called a....................... transformer.

a)

step left

b)

step right

c)

step up

d)

step down

133.

If a transformer increases voltage, it is called a ......... transformer.

a)

step right

b)

step left

c)

step up

d)

step down

134.

The winding of wire around a core which is connected to a source of energy is called the ....... coil.

a)

primary

b)

secondary

c)

tertiary

135.

Calculate potential difference in the secondary coil based on the information given below.


Vp = 240 V

Np = 20

Ns = 125

Vs ?

a)

1500

b)

500

c)

1000

d)

2000

136.

Which of the following is an example of appliance using alternating power source?

a)
b)
c)
d)
137.

Why transformers work with A.C. current but not D.C.

a)

A.C current produces changing magnetic field.

b)

D.C current produces changing magnetic field.

c)

D.C current is weak

d)

A.C current is powerful

138.

What is the material used for construction of transformer core?

a)

Aluminium

b)

Copper

c)

Iron

d)

Wood

139.

This picture is an example of a ________________.

a)

Motor

b)

Generator

c)

Step-up transformer

d)

Step-down transformer

140.

A transformer has 100 turns in the primary coil and 25 turns in the secondary coil. When a 120 V is applied to the primary coil, what is the voltage in the secondary coil?

a)

480V

b)

30V

c)

20V

d)

450V

141.

In order for electromagnetic induction to occur, there must be relative............between a magnetic field and a conductor.

a)

race

b)

Motion

c)

field

d)

voltage

142.

The magnetic field produced by an alternating current can be thought of as a ............................... magnetic field.

a)

moving magnetic field

b)

dynamic magetic field

c)

electrodynamic magnetic field

d)

magnetic field

143.

A laminated transformer core reduces the amount of energy that is wasted in the form of........

a)

solidifying

b)

flux

c)

heat

144.

Ratio of voltages is equal to ratio of _______________________.

a)

number of iron sheets in core

b)

number of coil

c)

number of turns in coil

d)

number of electromagnetic

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