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WorksheetsJunior Cert Physics: Energy Conversions
Total questions: 45
Worksheet time: 16mins
What is the energy conversion when you plug in a stereo and listen to music?
electrical to mechanical
chemical to heat
electrical to sound
potential to sound
What is the energy conversion when you burn wood for a fire?
electrical to thermal
light to kinetic
chemical to thermal
chemical to electrical
What is the energy conversion when you put batteries in a flashlight to make it turn on?
chemical to light
light to kinetic
chemical to thermal
nuclear to light
What is the energy conversion when you plug in a charger to charge a battery?
electrical to light
kinetic to potential
thermal to chemical
electrical to chemical
What is the energy conversion when you have a skateboard at the top of the hill then move down?
kinetic to potential
potential to kinetic
potential to thermal
electrical to kinetic
What is the energy conversion when a wind turbine turns to provide energy to a power grid?
electrical to potential
potential to kinetic
kinetic to electrical
nuclear to heat
What is the energy conversion when you feel the warmth of the sun?
nuclear to thermal
nuclear to kinetic
potential to nuclear
light to nuclear
What is the energy conversion when you plug in a fan?
potential to kinetic
potential to heat
heat to electrical
electrical to kinetic
What is the energy conversion when you eat food for fuel to go for a run?
chemical to nuclear
kinetic to chemical
chemical to kinetic
potential to chemical
What is the energy conversion when photosynthesis takes place as the sun makes a plant grow?
thermal to chemical
potential to nuclear
chemical to potential
light to chemical
What is the energy conversion when you burn charcoal to cook food on a grill?
thermal to chemical
light to kinetic
chemical to thermal
chemical to nuclear
What is the energy conversion when you use gasoline to make a car move?
chemical to kinetic
chemical to potential
potential to light
nuclear to kinetic
What is the energy conversion when water moves over a dam to power a city's energy grid?
electrical to chemical
kinetic to electrical
nuclear to electrical
kinetic to potential
What are the energy conversions when the sun shines on a solar panel that provides energy to a home?
nuclear to heat to electrical
nuclear to light to electrical
nuclear to electrical to light
nuclear to light to potential
Which of these objects converts light to chemical energy?
A. ethanol plant
B. light bulb
C. corn
D. solar cell
Which energy path shows one way energy can get to a light bulb?
sun → water → dam → light bulb
sun → air → wind turbine → light bulb
sun → corn → ethanol plant → light bulb
All of the answers are correct.
What is electrical energy converted to inside a toaster?
thermal energy and light
nuclear energy
chemical energy
kinetic energy
What do wind turbines, hydroelectric dams, and ethanol plants have in common?
All produce electrical current without pollution.
All use generators to produce electrical current.
All convert gravitational potential energy to electrical current.
All convert thermal energy to electrical current.
The following is a possible energy conversion path:
Sun - Solar Panels - Toaster
True
Flase
Where does a chicken get its energy?
directly from the Sun in the form of solar energy
from its food in the form of chemical energy
from running around in the form of kinetic energy
from flying up tp the roof of a barn in the form of potential energy
Which of the following is stored energy that exists based on the position of an object?
chemical energy
thermal energy
kinetic energy
gravitational potential energy
Fossil fuels _______________________________. That means there is a limited supply. Once the world runs out, there is no way to get more.
are clean-burning
are non-renewable resources
came to Earth on comets
are found in fossilized sea shells
Which of the following is the cleanest way to produce electricity?
Where on the track does the roller coaster train have the greatest potential energy?
Point 1
Point 2
Point 3
Point 4
Point 5
Which energy transformation below occurs in a blow dryer?
electrical ----> thermal
electrical -----> chemical
chemical -----> thermal
thermal ------> electrical
Which is an example of potential energy?
A child is hopping down the sidewalk.
A horse is galloping in a field.
A person is sitting on a horse.
A car is driving on the street.
What is electrical energy converted into when a drill is used?
Kinetic energy
Sound
Heat
All of the above
What is the efficiency of a solar cell if 1000 J of solar energy hits the cell and 200 J are converted into electrical energy?
10%
20%
30%
40%
What is energy?
moving energy
stored energy
renewable energy
The ability to do work.
The unit of work is
watt
hertz
joule
pascal
Rank in order, from largest to smallest, the gravitational potential energies of the balls.
1 > 2 = 4 > 3
1 > 2 > 3 > 4
3 > 2 = 4 > 1
3 > 2 > 4 > 1
One form of energy can sometimes change into more than one other energy form.
True
False
As a skateboarder travels up a half-pipe, how does his energy change?
His potential energy changes into kinetic energy.
His kinetic energy changes into potential energy.
His chemical energy changes into kinetic energy.
His thermal energy changes into potential energy.
Your body changes chemical energy from food into which forms of energy?
mechanical (move muscles)
thermal (body temperature)
nuclear (energy)
electrical (brain)
Which fossil fuel is created from the remains of dead plants and forms into a "rock?"
Coal
Petroleum
Natural Gas
Nuclear Energy
What raw materials are needed for respiration?
Water and carbon dioxide
Glucose (sugar) and oxygen
Glucose (sugar) and carbon dioxide
Water and oxygen
What raw materials are needed for photosynthesis?
Water and carbon dioxide
Glucose (sugar) and oxygen
Water and oxygen
Glucose (sugar) and carbon dioxide
A washing machine uses 250J of electrical energy to produce 125J of useful energy. How efficient is it?
5%
50%
55%
100%
What is this diagram called?
Stankey Diagram
Sankey Diagram
Sankay Diagram
Samkay Diagram
The energy efficiency shown in this diagram is:
About 10%.
About 30%.
About 60%.
Impossible to tell.
How much energy is lost as heat energy in the Sankey diagram shown?
110 J
90 J
100 J
10 J
