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WorksheetsElectricity 2.0 Review
Total questions: 95
Worksheet time: 2hrs 35mins
In a series circuit, if one bulb goes out, what happens to the other bulbs?
They get dimmer
They all go out
They get brighter
They stay the same
It gets confusing.
it takes less wire
If one load goes down, it does not affect the others.
the battery lasts longer
What happens to the total resistance in a parallel circuit when more resistors are added?
It doubles
It increases
It decreases
It stays the same
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?
Light bulb 1 and light bulb 2 will both be on
Light bulb 1 will be off, but light bulb 2 will be on
Light bulb 1 and light bulb 2 will both be off
Light bulb 1 will be on, but light bulb 2 will be off
If you add another bulb in parallel,_____
All the bulbs will go out
The bulbs get dimmer
The bulb brightness stays the same
If the middle bulb goes out, _______
The other bulb goes out
The other bulb's brightness stays the same
The other bulb gets dimmer
Students constructed a circuit using different-colored lightbulbs. What will happen if Switch 3 is closed and the other switches are left open?
Only the white bulb will operate
None of the bulbs will operate
Only the white and yellow bulbs will operate
Only the red and blue bulbs will operate
Which switch(s) need to be closed for only lightbulb 2 to glow?
A only
B only
A and B
A, B, and C
In which situation will the globe(s) glow brighter compared to the other situations? (assuming all lightbulbs and batteries are identical)
X only
Y only
X and Y
X, Y, and Z are all the same brightness
A circuit was made to make reading lights for six people. Which of the following circuits would allow each person to turn his or her own light on or off?
Which one of the following correctly describes how a voltmeter and ammeter need to be connected to a circuit?
both need to be connected in series
both need to be connected in parallel
a voltmeter in parallel, an ammeter in series
a voltmeter in series, an ammeter in parallel
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?
Electrical energy is the energy
stored in chemicals
of charged particles
of all the moving particles in a substance
built up by friction
Example of electrical energy changing to light energy.
Light Bulb
Batteries
Glow Stick
Plants
The energy transformation that occurs in the circuit above when the switch is closed is
chemical energy → electrical energy → light and thermal energy
light energy → electrical energy → chemical and thermal energy
thermal energy → chemical energy → electrical and light energy
chemical energy → thermal energy → electrical and light energy
energy is transferred through electromagnetic waves.
Nuclear
Radiant
Thermal
Potential
Potential
mechanical Kinetic
Sound
Gravitational
What device transforms heat energy into electrical energy?
Photoelectric
Piezoelectric effect
Thermocouple
Battery cell
What device transforms chemical energy into electrical energy?
lamp
motor
Thermocouple
Battery Cell
A team of students constructed a solar-powered car for their science fair project. The car was made by hooking up the car assembly to a motor and a solar panel.
In travelling across the room, the car converted
radiant energy into mechanical energy into electrical energy
radiant energy into potential energy into electrical energy
radiant energy into thermal energy into chemical energy
radiant energy into electrical energy into mechanical energy
Which of these might spin a generator at a power plant to produce electricity?
wind
water
steam from burning coal
all of these
Which part INCREASES the voltage of the power supply?
Power Station
Step Up Transformer
Transmission Cables
Step Down Transformer
Homes
Which part DECREASES the voltage of the power supply?
Power Station
Step Up Transformer
Transmission Cables
Step Down Transformer
Homes
Which part burns FOSSIL FUELS?
Power Station
Step Up Transformer
Transmission Cables
Step Down Transformer
Homes
What is happening at stage 1 in the diagram?
fuel is burned to boil water to make steam
steam makes a turbine spin
the spinning turbine turns a generator which produces electricity
the electricity goes to the transformers to produce the correct voltage
What is happening at stage 2 in the diagram?
fuel is burned to boil water to make steam
steam makes a turbine spin
the spinning turbine turns a generator which produces electricity
the electricity goes to the transformers to produce the correct voltage
What is happening at stage 3 in the diagram?
fuel is burned to boil water to make steam
steam makes a turbine spin
the spinning turbine turns a generator which produces electricity
the electricity goes to the transformers to produce the correct voltage
What is happening at stage 4 in the diagram?
fuel is burned to boil water to make steam
steam makes a turbine spin
the spinning turbine turns a generator which produces electricity
the electricity goes to the transformers to produce the correct voltage
Sam wraps a coil of wire around an iron nail. He attached the end of the wire to a battery and then used the nail to pick up a paper clip. Why is Sam able to pick up the paper clips with the nail.
the current passing thorough the wires produced a magnetic field.
paper clips are conductors of electrical current
the nail produces an electrical current in the wires.
the magnetic field of the nail causes a current to flow in the wires
How are electromagnets different from permanent magnets?
permanent magnets can be turned on/off
you can turn an electromagnet on/off
permanent magnets are more powerful
permanent magnets have a North and South pole
Ronaldo and Nasreen build an electromagnet by rapping a wire around a nail and connect the wire around a nail and connecting the wire to both terminals of a battery. When they test the electromagnet, it can pick up 6 paper clips. Their teacher wants all groups to pick up at least 10 paper clips. What could Renaldo and Nasreen do to increase the number of clips their electromagnet picks up?
make a wire longer
increase the number of loops of wire around the nail
remove the nail from the center of the wire
spread the loops of wire part on the nail so they do not touch
In an electric generator, the energy transformation begins as ----
electrical and becomes chemical
mechanical and becomes electrical
electrical and becomes mechanical
mechanical and becomes chemical
Which of the following is spun due to the interactions between the magnetic fields?
powersupply
field magnets
commutator
armature
In the image of the motor, what is letter B?
Armature
Commutator
Permanent Magnet
Energy Source
Look at the picture what is letter D?
Armature
Commutator
Permanent Magnet
DC Source
Brush
Which of the following allows the current in the electromagnet of a motor or generator to change directions every half turn?
Powersupply
field magnets
commutator
armature
An electric motor is used in the compressor of a refrigerator. The motor is responsible for helping circulate the coolant liquid through two sets of coils: the compressor and the evaporator . In this case, the motor is __________.
Using the magnetic field to cool the refrigerator
converting mechanical energy into electrical energy
using a magnetic field to create electrical energy.
converting electrical energy into mechanical energy.
Which component is responsible for converting mechanical energy into electrical energy in a generator?
Commutator
Field Magnets
Power Supply
Armature
Motor or Generator?
Motor
Generator
Which of these is the best description of a motor?
something spins -> moving magnets -> electric current
electric current -> moving magnets -> something spins
moving magnets -> something spins -> electric current
electric current -> nothing happens
Which of these is the best description of a generator?
something spins -> moving magnets -> electric current
electric current -> moving magnets -> something spins
moving magnets -> something spins -> electric current
electric current -> nothing happens
Classify as most related to power or energy
measured in Watts
Measured in J
Measured in kWh
rate at which a device uses energy
total amount of energy a device uses
current x voltage
power x time
What will be the current drawn by an electric bulb of 1000 W when it is connected to a source of 220 V?
4.55 A
28800 J or 28.8 KJ
80 W
200 W
The unit of energy is?
Amp
Joule
kiloWatt
Volt
A kilowatt (kW) is how many watts?
10
50
100
1000
A kettle has a power rating of 2 kW, if it's left on for 6 hours, how much energy in kWh is consumed?
10
3
12
24
Calculate the voltage applied when a 60 watt light-bulb uses a current of 5 amps
300 volts
30 volts
12 volts
0.08 volts
Total energy = 200J Useful energy = 20J Workout the efficiency of this lightbulb. efficiency = total energy inuseful enegy ×100
100%
80%
40%
10%
Calculate the percent efficiency of an electric motor that uses 15 000 J of energy to produce 11 500 J of useful movement.
76.6%
82.3%
75.4%
23.3%
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?
62.5%
.625%
37.5%
.375%
The most efficient device would most likley be
a heater
an incandescent light bulb
a gas engine motor
a generator
An incandescent light is 5% efficient. Ths means that
Most of the input energy is converted into usable light energy
Very little of the input energy is converted into usable light energy
Most of the output energy is converted into usable light energy
Very little of the output energy is converted into usable light energy
Which type of car engine is more efficient?
Gas
Electric
What is the efficiency of the LED light shown?
25%
75%
100%
100J
What is the efficiency of the TV?
50%
40%
10%
100%
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
solar
biomass
geothermal
natural gas
What is the energy transformation in hydroelectric dams?
Kinetic to electrical
Kinetic to heat
Electric to kinetic
Sound to electric
geothermal
solar
wind
What type of power plant uses scraps from farming, waste products and wind to generate electricity?
Hydroelectric Power Plant
Geothermal Power Plant
Biomass Power Plant
Nuclear Power Plant
Name the type of power station.
Thermal Power Station
Nuclear Power Station
Hydroelectric Power Station
Biomass Power Station
Name the type of power station.
Thermal Power Station
Nuclear Power Station
Wind Power Station
Solar Power Station
They do not produce emissions
They can interfere with bird migration
They're more expensive in the long run than fossil fuels
They must be placed near moving water
This power plant produces electricity most likely by using-
Which of the following sequences shows the transfer of energy initiated by the flow of water in a hydroelectric power plant?
mechanical-gravitational-electrical
electrical-gravitational-mechanical
gravitational-electrical-mechanical
gravitational-mechanical-electrical
Which of the following process is used in a turbine?
Converting fuel into heat
Converting thermal energy in steam to mechanical energy
Electromagnetic induction
Converting electrical energy into mechanical energy
Which are the problems of using solar power?
It provides unlimited supply of energy.
A large piece of land is needed to place the solar cells.
The solar cells do not work at night.
Why are fossil fuels not a good long term energy source? Choose all that apply.
they produce emissions that are harmful to the environment
they have a limited supply
they are renewable
they are not as reliable as solar power
How does solar energy contribute to sustainability?
It reduces greenhouse gas emissions and dependence on fossil fuels.
It increases greenhouse gas emissions and dependence on fossil fuels.
It has no impact on greenhouse gas emissions or dependence on fossil fuels.
It contributes to deforestation and air pollution.
Match the following statements with the perspective
The government should provide incentives to install solar panels onto houses
Political
Most solar panels use silicon and glass materials
Technological
Solar panels work because of the photoelectric effect
Scientific
While solar panels may be costly to purchase they reduce long term costs of electricity
economic
Wind turbines can cause noise pollution
environmental
What is the responding variable in this graph?
time of day
Power output
Solar power output and Time of day
noon
What trend is evident in this graph?
as the time of day increases, the solar panel output increases
as the time of day increases, the solar panel output decreases
Solar panel output increases until midday, then decreases
there is no relationship between time of day and solar panel output
