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Electricity 2.0 review

Total questions: 74

Worksheet time: 2hrs 36mins

Name
Class
Date
1.
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
2.
What kind of circuit is this?
a)
series
b)
parallel
3.
Does this diagram represent a series or parallel circuit?
a)
series circuit
b)
parallel circuit
4.
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

5.
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.
6.

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

7.

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

8.

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

9.
As resistors are added in series to a circuit, the total resistance will...
a)
increase
b)
decrease
c)
stay the same
10.

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

11.
Which of the two circuits would have the brightest bulbs? 
a)
A
b)
B
12.

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

13.

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

14.

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

15.

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)
16.

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

17.

Example of electrical energy changing to light energy.

a)

Light Bulb

b)

Batteries

c)

Glow Stick

d)

Plants

18.

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

19.

energy is transferred through electromagnetic waves.

a)

Nuclear

b)

Radiant

c)

Thermal

d)

Potential

20.
Energy of motion is which type of energy?
a)

Potential

b)

mechanical Kinetic

c)

Sound

d)

Gravitational

21.
What kind of energy is represented in the picture?
a)
Thermal
b)
Chemical
c)
Sound
d)
Nuclear
22.
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
23.
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
24.
According to the Law of Conservation of Energy, energy cannot be _________ or ____________. 
a)
destroyed, destroyed
b)
created, saved
c)
created, destroyed
d)
lost, found
25.

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

26.
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.
27.

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

28.

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

29.

Which part burns FOSSIL FUELS?

a)

Power Station

b)

Step Up Transformer

c)

Transmission Cables

d)

Step Down Transformer

e)

Homes

30.

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

31.

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

32.

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

33.

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

34.
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
35.

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

36.
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
37.

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

38.

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.

39.
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
40.

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

a)

powersupply

b)

field magnets

c)

commutator

d)

armature

41.

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

a)

Armature

b)

Commutator

c)

Permanent Magnet

d)

Energy Source

42.

Look at the picture what is letter D?

a)

Armature

b)

Commutator

c)

Permanent Magnet

d)

DC Source

e)

Brush

43.

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

44.

Motor or Generator?

a)

Motor

b)

Generator

45.

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

46.

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

47.
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
48.
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
49.

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

50.

The unit of energy is?

a)

Amp

b)

Joule

c)

kiloWatt

d)

Volt

51.

A kilowatt (kW) is how many watts?

a)

10

b)

50

c)

100

d)

1000

52.

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

53.

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

54.
What is the power of a 20V bulb with 5A through it?
a)
100W
b)
100V
c)
6.3W
d)
6.3A
55.

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%

56.

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%

57.

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%

58.
No machine in existence has 100% efficiency due to ____________________.
a)
magic
b)
friction
c)
smoke
d)
input
59.
In energy transformations, "wasted energy" usually takes what form?
a)
heat
b)
chemical energy
c)
light
d)
sound waves
60.
Based on the data collected, which source of alternative energy is most efficient?
a)
Coal
b)
Wind
c)
Natural gas
d)
Solar
61.
Which of the following is a fossil fuel?
a)
Wind
b)
Coal
c)
Solar
d)
Biomass
62.

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

63.

What is the energy transformation in hydroelectric dams?

a)

Kinetic to electrical

b)

Kinetic to heat

c)

Electric to kinetic

d)

Sound to electric

64.
According to the graph, what sector is the greatest user of energy?
a)
industry
b)
commercial
c)
transportation
d)
residential
65.
What is the best title for the following?
geothermal
solar
wind
a)
fossil fuels
b)
nonrenewable energy
c)
heat energy
d)
renewable energy
66.

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

67.

Name the type of power station.

a)

Thermal Power Station

b)

Nuclear Power Station

c)

Hydroelectric Power Station

d)

Biomass Power Station

68.

Name the type of power station.

a)

Thermal Power Station

b)

Nuclear Power Station

c)

Wind Power Station

d)

Solar Power Station

69.
One problem with ____ energy is that it produces radioactive waste. 
a)
nuclear
b)
solar
c)
tidal
d)
geothermal
70.
Which alternative energy source does this information describe?
a)
Hydroelectricity
b)
Solar energy
c)
Biofuels
d)
Wind
71.
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

72.
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
73.

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.

74.

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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