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Electricity Unit Reivew

Total questions: 136

Worksheet time: 3hrs 34mins

Name
Class
Date
1.
If an object has more positive than negative charges, its electrical charge is...
a)
positive
b)
negative
c)
neutral or no charge
d)
opposite
2.
If you rub a glass rod with a piece of silk, the rod becomes positively charged. This means that
a)
friction destroyed electrons in the rod.
b)
the silk has become negatively charged.
c)
protons have moved to the rod.
d)
glass attracts more protons.
3.
Objects that have opposite charges
a)
are attracted to each other, and the force between the objects pulls them together.
b)
are attracted to each other, and the force between the objects pushes them apart.
c)
are repelled by each other, and the force between the objects pulls them together.
d)
are repelled by each other, and the force between the objects pushes them apart.  
4.
What is the major difference between static electricity and current electricity?
a)
Current electricity involves a continuous flow of neutrons; static electricity is a sudden transfer of protons
b)
Current electricity can be deadly; static electricity is almost always safe
c)
In current electricity, there's a single transfer of electrons; in static electricity, there's a steady flow of electrons
d)
Current electricity involves a flow of electrons; static electricity involves a single transfer of electrons
5.

Ms Pippin rubbed two balloons with a piece of wool. What will happen when the balloons are brought near each other?

a)

The balloons will repel each other.

b)

The balloons will attract each other.

c)

The balloons will become positively (+) charged.

d)

The balloons will pop.

6.
If a substance has a higher number of electrons than protons on its surface, what type of charge does it have?
a)
A positive charge.
b)
A negative charge.
c)
A neutral charge
d)
No charge at all
7.

Will the balloons ATTRACT or REPEL each other?

a)
b)
8.

What happens when you touch a metal doorknob after rubbing your shoes on the carpet?

a)

The doorknob sends a burst of electric current into your body

b)

Millions of electrons go from your finger into the doorknob

c)

The doorknob sends millions of electrons into your finger

d)

Your finger becomes negatively charged

9.
Which of the following is caused by static electricity?
a)
a stove getting hot when it is turned on
b)
a magnet being attracted to a refrigerator
c)
a lightning strike during a storm
d)
a light bulb coming on when a switch is turned on
10.
The girl's hair and the comb are attracting  one another.  The hair and the comb have
a)
opposite charges
b)
like charges
11.

According to the illustration, the charge on Object A is ______________, and the charge on Object C is ______________.

a)

negative, positive

b)

positive, negative

c)

positive, positive

d)

negative, negative

12.

Why does a Van de Graaff generator make your hair stand up if you touch the dome?

a)

The current is trying to flow out of the hair ends.

b)

The electrons gather on the hair ends and repel each other.

c)

The hair is repelled by the dome of the Van de Graaff generator.

d)

The hair is attracted to the surrounding air.

13.

Charged objects attract neutral objects because

a)

of charge separation (polarization) in the neutral oject

b)

electrons flow from one object to the next

c)

of electrical discharge

d)

of current flow of electricity

14.

What is an electric current?

a)

a build up of electrons

b)

the difference in charge between 2 points

c)

the flow of electrons over a circuit

d)

the opposition to flow of electrons

15.
What is another name for a lightbulb in a circuit?
a)
Switch
b)
Load
c)
Power Source
16.

Which statement is true?

a)

The light bulb will light up because the circuit is complete.

b)

The light bulb will light up because the circuit is broken.

c)

The light bulb will not light up because the circuit is complete.

d)

The light bulb will not light up because the circuit is open.

17.
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
18.
this circuit is .....?
a)
open
b)
parallel
c)
closed
d)
The cutest little circuit evah!
19.
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
20.

Which schematic circuit matches this circuit picture?

a)
b)
c)
21.

What components are in this schematic diagram?

a)

battery, switch, bulb, wire

b)

switch, switch, bulb

c)

battery, switch, bulb, motor

22.

In the diagram above, identify circuit component D.

a)

Switch

b)

Transformer

c)

Conductor

d)

Source

23.
) What would happen if an extra battery cell is added?
a)
A)The lights will glow dim
b)
The wire will glow
c)
The lights will glow brighter
d)
None of the above
24.

A PATH along which electricity can flow is a ___________________?

a)

light bulb

b)

switch

c)

insulator

d)

circuit

25.

The path of electricity through a circuit

a)

Electrons move from the negative terminal of battery, through all components, and return to the positive terminal of the battery.

b)

Electrons move from the positive terminal of battery, through all components, and return to the negative terminal of the battery.

c)

Electrons come from the negative terminal of battery and are absorbed by circuit components.

d)

Electrons come from the positive terminal of battery and are absorbed by circuit components.

26.
Materials that tightly hold on to their electrons are considered 
a)
Good conductors
b)
Good insulators
c)
Good anti-static agents
d)
Useful for storing charge
27.
The plastic covering is there to:
a)
Provide a conductor for electrical energy to flow.
b)
Provide an insulator so that electrical energy will not pass outside of the wires.
c)
Provide a conductor so that electrical energy can NOT flow.
d)
Provide an insulator so that electrical energy can flow.
28.

A student is testing the conductivity of 4 different substances. He uses a 2.5 V battery and records the current in the circuit in each of the 4 substances. The chart below indicates the current measured.

Which substance is most likely an insulator?

a)

Substance Q

b)

Substance R

c)

Substance S

d)

Substance T

29.

What is the purpose of a lightning rod?

a)

So birds won't sit on the roof

b)

To look cool

c)

To safely send electric charges from lightning into the ground

30.
a switch that automatically opens if the current in the circuit is too high
a)
parallel circuit
b)
circuit breaker
c)
series circuit
d)
load
31.

A connection that allows current to take the path of least resistance is a

a)

short circuit

b)

long circuit

c)

parallel circuit

d)

series circuit

32.

Look at the picture above! why is it not allowed?

a)

Because it will make people stumble and hurt

b)

Because it makes the house messy

c)

Because creates the risk of wire overheating from too much energy

d)

Because it incurs huge electricity bills from too much energy

33.

Without a fuse or circuit breaker, what might happen in a house with an overloaded electric circuit?

a)

the thin piece of metal would melt, breaking the circuit

b)

the metal band would heat up, disrupting the circuit

c)

a fire would start

d)

the electricity for the house would turn off

34.

You want to build a device that can conduct current, but that will be safe if touched by a person. Which of the following pairs of materials could you use?

a)

glass for the conductor and rubber for the insulator

b)

copper for the insulator and silver for the conductor

c)

sand for the conductor and plastic for the insulator

d)

plastic for the insulator and silver for the conductor

35.

What is the difference between a fuse and a circuit breaker?

a)

a fuse can only be used once and a circuit breaker is reusable

b)

a fuse is reusable and a circuit breaker can only be used once

c)

both fuses and circuit breakers can only be used once

d)

both fuses and circuit breakers are reusable

36.

Which is more dangerous to humans?

a)

high voltage

b)

high current

37.
liquid in a battery that allows electrons to move from one metal to the other (fruit juice, vinegar)
a)
Wet Cells
b)
Dry Cells
c)
Electrolyte
d)
Electrodes
38.
a type of cell that contains solid or pastelike electrolytes
a)
Wet Cells
b)
Dry Cells
c)
Electrolytes
d)
Electrodes
39.

Which of the following changes to the cell shown above would result in voltage being produced?

a)

Reversing the leads on the voltmeter

b)

Using a greater volume of sulfuric acid

c)

Replacing 5% sulfuric acid with 20% sulfuric acid

d)

Changing one of the electrodes to a zinc electrode

40.

What kind of cell is this?

a)

electrochemical cell

b)

electrolytic cell

41.

What was the manipulated variable in this lab?

a)

type of wet cell

b)

acid concentration

c)

voltage

d)

acid concentration vs voltage

42.

What is the relationship between acid concentration and voltage?

a)

the the greater the acid concentration the greater the voltage

b)

the the greater the acid concentration the lower the voltage

c)

acid concentration is not related to Voltage

43.
Voltage is simply defined as...
a)
what 'pushes' electrons
b)
what 'stops' electrons
c)
moving electrons
44.
The flow/movement of electric charges 
a)
Voltage
b)
Resistance 
c)
Current 
d)
Circuit 
45.

In the model, what do the arrows represent?

a)

The flow of current

b)

The flow of resistance

c)

The flow of voltage

d)

The flow of positrons

46.

In this model, the moped riders represent the

a)

power pack

b)

bulbs

c)

flow of charge

d)

ammeter

47.

In this model, the electrical energy carried around the circuit is represented as the

a)

pizza

b)

party goers

c)

party house

d)

roads going back and forth the house

48.

In this model, the pump that pushes water round the system represents the

a)

battery

b)

electricity

c)

voltmeter

d)

bulb

49.

In this model, the pipes are like ....... they carry ......... round the circuit

a)

wires; voltage

b)

bulbs; current

c)

bulbs; voltage

d)

wires; current

50.

If an electrical circuit were analogous to a water circuit at a water park, then the battery voltage would be comparable to ___________________.

a)

the rate at which water flows through the circuit

b)

the speed at which water flows through the circuit

c)

the distance that water flows through the circuit

d)

the water pressure between the top and bottom of the circuit

e)

the hindrance caused by obstacles in the path of the moving water

51.
Current has units: 
a)
kilowatt·hour 
b)
ampere 
c)
coulomb 
d)
volt 
52.

If you decrease the voltage of circuit, what happens?

a)

Current decreases

b)

Current increases

53.

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

a)

Increase

b)

Decrease

c)

Stay the same

54.

what is the resistance of a lamp whose current is 6 A and the voltage across it is 120 V?

a)

120 0hm

b)

20 ohm

c)

16 ohm

d)

10 ohm

55.
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
56.
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
57.

Which of the following has the least resistance?

a)

Long, thin wires

b)

Short, thick wires

c)

Long, thick wires

d)

Short, thin wires

58.
What is Resistance?
a)
The flow of electrons
b)
Electric potential difference
c)
A battery
d)
The ability to reduce the flow of electrons
59.
What is resistance measured in?
a)
Ω (Ohms)
b)
V (Volts)
c)
A (Amps)
d)
W (Watts)
60.

What is the formula for voltage?

a)

V = (I x R) / 2

b)

V = I / R

c)

V = R / I

d)

V = I x R

61.

Based on the model, which of the following would be true regarding the relationship between voltage, current, and resistance?

a)

Current will reduce voltage.

b)

Current will not pass through resistance.

c)

Resistance will reduce current.

d)

Voltage will reduce resistance.

62.

Based on the graph, which of the following would be true regarding the relationship of voltage and current?

a)

As voltage increases, current decreases.

b)

Voltage will not affect current.

c)

As voltage decreases, current increases.

d)

As voltage increases, current also increases.

63.
What is a Parallel circuit? 
a)
Has only one path 
b)
Has more than one path 
c)
Allows energy to travel through easily 
d)
Has only one light bulb
64.
What kind of circuit is this?
a)
series
b)
parallel
65.
Does this diagram represent a series or parallel circuit?
a)
series circuit
b)
parallel circuit
66.
What is one benefits of using a parallel circuit?  
a)

It gets confusing.

b)

it takes less wire

c)

If one load goes down, it does not affect the others. 

d)

the battery lasts longer

67.
Why are homes not wired in series circuits?
a)
The house will burn down
b)
If you turn off one appliance, the rest will turn off. 
c)
Homes are wired in series circuits.
68.

A student builds a circuit made up of a battery, two light bulbs, and a switch. What will the student most likely observe in this circuit?

a)

Light bulb 1 and light bulb 2 will both be on

b)

Light bulb 1 will be off, but light bulb 2 will be on

c)

Light bulb 1 and light bulb 2 will both be off

d)

Light bulb 1 will be on, but light bulb 2 will be off

69.

If you add another bulb in parallel,_____

a)

All the bulbs will go out

b)

The bulbs get dimmer

c)

The bulb brightness stays the same

70.

If the middle bulb goes out, _______

a)

The other bulb goes out

b)

The other bulb's brightness stays the same

c)

The other bulb gets dimmer

71.
As resistors are added in series to a circuit, the total resistance will...
a)
increase
b)
decrease
c)
stay the same
72.

Students constructed a circuit using different-colored lightbulbs. What will happen if Switch 3 is closed and the other switches are left open?

a)

Only the white bulb will operate

b)

None of the bulbs will operate

c)

Only the white and yellow bulbs will operate

d)

Only the red and blue bulbs will operate

73.
Which of the two circuits would have the brightest bulbs? 
a)
A
b)
B
74.

Which switch(s) need to be closed for only lightbulb 2 to glow?

a)

A only

b)

B only

c)

A and B

d)

A, B, and C

75.

In which situation will the globe(s) glow brighter compared to the other situations? (assuming all lightbulbs and batteries are identical)

a)

X only

b)

Y only

c)

X and Y

d)

X, Y, and Z are all the same brightness

76.

Which one of the following correctly describes how a voltmeter and ammeter need to be connected to a circuit?

a)

both need to be connected in series

b)

both need to be connected in parallel

c)

a voltmeter in parallel, an ammeter in series

d)

a voltmeter in series, an ammeter in parallel

77.

Jake needs to repair a car stereo system. The system contains a stereo and a fuse that are connected in series and two speakers that are connected in parallel.

Which of the following diagrams represents the car stereo system described above?

a)
b)
c)
d)
78.

Electrical energy is the energy

a)

stored in chemicals

b)

of charged particles

c)

of all the moving particles in a substance

d)

built up by friction

79.

Example of electrical energy changing to light energy.

a)

Light Bulb

b)

Batteries

c)

Glow Stick

d)

Plants

80.

The energy transformation that occurs in the circuit above when the switch is closed is

a)

chemical energy → electrical energy → light and thermal energy

b)

light energy → electrical energy → chemical and thermal energy

c)

thermal energy → chemical energy → electrical and light energy

d)

chemical energy → thermal energy → electrical and light energy

81.

energy is transferred through electromagnetic waves.

a)

Nuclear

b)

Radiant

c)

Thermal

d)

Potential

82.
Energy of motion is which type of energy?
a)

Potential

b)

mechanical Kinetic

c)

Sound

d)

Gravitational

83.
What kind of energy is represented in the picture?
a)
Thermal
b)
Chemical
c)
Sound
d)
Nuclear
84.
Which of the following devices transforms electrical energy into mechanical energy?
a)
An e-reader
b)
a fan
c)
a manual pencil sharpener
d)
ipod
85.
What energy transformations take place when a battery-operated radio is in use?
a)
Electrical to chemical to light
b)
Sound to chemical to mechanical
c)
Chemical to electrical to sound
d)
Light to electrical to thermal
86.
According to the Law of Conservation of Energy, energy cannot be _________ or ____________. 
a)
destroyed, destroyed
b)
created, saved
c)
created, destroyed
d)
lost, found
87.

Which of these might spin a generator at a power plant to produce electricity?

a)

wind

b)

water

c)

steam from burning coal

d)

all of these

88.
How is electrical energy usually produced?
a)
Fuel is burned to produce smoke, which turns a turbine.
b)
Fuel is burned to heat water and produce steam, which turns a turbine.
c)
Hot fuel is placed in water to produce steam, which then turns a turbine.
d)
A turbine blows hot steam onto fuel, which heats it up and produces electricity.
89.

Which part INCREASES the voltage of the power supply?

a)

Power Station

b)

Step Up Transformer

c)

Transmission Cables

d)

Step Down Transformer

e)

Homes

90.

Which part DECREASES the voltage of the power supply?

a)

Power Station

b)

Step Up Transformer

c)

Transmission Cables

d)

Step Down Transformer

e)

Homes

91.

Which part burns FOSSIL FUELS?

a)

Power Station

b)

Step Up Transformer

c)

Transmission Cables

d)

Step Down Transformer

e)

Homes

92.

What is happening at stage 1 in the diagram?

a)

fuel is burned to boil water to make steam

b)

steam makes a turbine spin

c)

the spinning turbine turns a generator which produces electricity

d)

the electricity goes to the transformers to produce the correct voltage

93.

What is happening at stage 2 in the diagram?

a)

fuel is burned to boil water to make steam

b)

steam makes a turbine spin

c)

the spinning turbine turns a generator which produces electricity

d)

the electricity goes to the transformers to produce the correct voltage

94.

What is happening at stage 3 in the diagram?

a)

fuel is burned to boil water to make steam

b)

steam makes a turbine spin

c)

the spinning turbine turns a generator which produces electricity

d)

the electricity goes to the transformers to produce the correct voltage

95.

What is happening at stage 4 in the diagram?

a)

fuel is burned to boil water to make steam

b)

steam makes a turbine spin

c)

the spinning turbine turns a generator which produces electricity

d)

the electricity goes to the transformers to produce the correct voltage

96.
What device is made of coils of wire with an electrical current passing through it in order to generate a magnetic field?  
a)
Electromagnet 
b)
Generator
c)
Electron Magnet 
d)
Motor
97.

How are electromagnets different from permanent magnets?

a)

permanent magnets can be turned on/off

b)

you can turn an electromagnet on/off

c)

permanent magnets are more powerful

d)

permanent magnets have a North and South pole

98.
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
99.

In an electric generator, 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

100.

What can you do to make electromagnets stronger?

a)

Increase number of coils of wire.

b)

Increase number of batteries used.

c)

Both A and B.

d)

Neither A nor B.

101.
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
102.

Which of the following is spun due to the interactions between the magnetic fields?

a)

powersupply

b)

field magnets

c)

commutator

d)

armature

103.

In the image of the motor, what is letter B?

a)

Armature

b)

Commutator

c)

Permanent Magnet

d)

Energy Source

104.

Look at the picture what is letter D?

a)

Armature

b)

Commutator

c)

Permanent Magnet

d)

DC Source

e)

Brush

105.

Which of the following allows the current in the electromagnet of a motor or generator to change directions every half turn?

a)

Powersupply

b)

field magnets

c)

commutator

d)

armature

106.

Motor or Generator?

a)

Motor

b)

Generator

107.

Which of these is the best description of a motor?

a)

something spins -> moving magnets -> electric current

b)

electric current -> moving magnets -> something spins

c)

moving magnets -> something spins -> electric current

d)

electric current -> nothing happens

108.

Which of these is the best description of a generator?

a)

something spins -> moving magnets -> electric current

b)

electric current -> moving magnets -> something spins

c)

moving magnets -> something spins -> electric current

d)

electric current -> nothing happens

109.
The power of an appliance is...
a)
the amount of voltage going through it 
b)
the amount of energy transferred per second
c)
the amount of charge that passes through per second
110.
The voltage supplied to a circuit is 17 V and the current running through is 10 A. What is the power generated?
a)
170 W
b)
170 A
c)
1.7 V
d)
1.7 W
111.

What will be the current drawn by an electric bulb of 1000 W when it is connected to a source of 220 V?

a)

4.55 A

b)

28800 J or 28.8 KJ

c)

80 W

d)

200 W

112.

The unit of energy is?

a)

Amp

b)

Joule

c)

kiloWatt

d)

Volt

113.

A kilowatt (kW) is how many watts?

a)

10

b)

50

c)

100

d)

1000

114.

A kettle has a power rating of 2 kW, if it's left on for 6 hours, how much energy in kWh is consumed?

a)

10

b)

3

c)

12

d)

24

115.

Calculate the voltage applied when a 60 watt light-bulb uses a current of 5 amps

a)

300 volts

b)

30 volts

c)

12 volts

d)

0.08 volts

116.
What is the power of a 20V bulb with 5A through it?
a)
100W
b)
100V
c)
6.3W
d)
6.3A
117.

Total energy = 200J Useful energy = 20J Workout the efficiency of this lightbulb. efficiency = useful enegytotal energy in ×100efficiency\ =\ \frac{useful\ enegy}{total\ energy\ in}\ \times100  

a)

100%

b)

80%

c)

40%

d)

10%

118.

Calculate the percent efficiency of an electric motor that uses 15 000 J of energy to produce 11 500 J of useful movement.

a)

76.6%

b)

82.3%

c)

75.4%

d)

23.3%

119.

A TV uses 200 J of electricity and transforms it into 125 J of sound and light and 75 J of heat. How efficient is it?

a)

62.5%

b)

.625%

c)

37.5%

d)

.375%

120.
No machine in existence has 100% efficiency due to ____________________.
a)
magic
b)
friction
c)
smoke
d)
input
121.
In energy transformations, "wasted energy" usually takes what form?
a)
heat
b)
chemical energy
c)
light
d)
sound waves
122.
Based on the data collected, which source of alternative energy is most efficient?
a)
Coal
b)
Wind
c)
Natural gas
d)
Solar
123.
Which of the following is a fossil fuel?
a)
Wind
b)
Coal
c)
Solar
d)
Biomass
124.

The advantages and disadvantages of a particular energy source are shown in the following table. The energy source being described in the table above is most likely

a)

solar

b)

biomass

c)

geothermal

d)

natural gas

125.

What is the energy transformation in hydroelectric dams?

a)

Kinetic to electrical

b)

Kinetic to heat

c)

Electric to kinetic

d)

Sound to electric

126.
According to the graph, what sector is the greatest user of energy?
a)
industry
b)
commercial
c)
transportation
d)
residential
127.
What is the best title for the following?
geothermal
solar
wind
a)
fossil fuels
b)
nonrenewable energy
c)
heat energy
d)
renewable energy
128.

What type of power plant uses scraps from farming, waste products and wind to generate electricity?

a)

Hydroelectric Power Plant

b)

Geothermal Power Plant

c)

Biomass Power Plant

d)

Nuclear Power Plant

129.

Name the type of power station.

a)

Thermal Power Station

b)

Nuclear Power Station

c)

Hydroelectric Power Station

d)

Biomass Power Station

130.

Name the type of power station.

a)

Thermal Power Station

b)

Nuclear Power Station

c)

Wind Power Station

d)

Solar Power Station

131.
One problem with ____ energy is that it produces radioactive waste. 
a)
nuclear
b)
solar
c)
tidal
d)
geothermal
132.
Which alternative energy source does this information describe?
a)
Hydroelectricity
b)
Solar energy
c)
Biofuels
d)
Wind
133.
What is one of the biggest disadvantages to wind turbines?
a)

They do not produce emissions

b)

They can interfere with bird migration

c)

They're more expensive in the long run than fossil fuels

d)

They must be placed near moving water

134.
The poster shown below advertises tours of a power plant.
This power plant produces electricity most likely by using-
a)
fossil fuels
b)
biofuels
c)
solar energy
d)
geothermal energy
135.

Which are the problems of using solar power?

a)

It provides unlimited supply of energy.

b)

A large piece of land is needed to place the solar cells.

c)

The solar cells do not work at night.

136.

Why are fossil fuels not a good long term energy source? Choose all that apply.

a)

they produce emissions that are harmful to the environment

b)

they have a limited supply

c)

they are renewable

d)

they are not as reliable as solar power

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