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WorksheetsEnergy Power and Work done Igcse
Total questions: 75
Worksheet time: 38mins
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%
A
B
C
D
What is electrical energy converted into when a drill is used?
Kinetic energy
Sound
Heat
All of the above
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
What is designed to change electrical energy into kinetic energy?
A. capacitor
B. generator
C. motor
D. transformer
A ____ converts chemical energy into kinetic energy?
Shooting an arrow from a bow converts ____ into kinetic energy.
Elastic potential energy
Chemical energy
Gravitational potential energy
Thermal energy
Energy which is transferred by a force moving an object through a distance
Mechanically
Electrically
By Radiation
By Heating
Two negatively charged particles which are close together have energy in this energy store
Electrostatic
Magnetic
Nuclear
Elastic
A stretched rubber band has energy in this energy store
Magnetic
Electrostatic
Elastic
Nuclear
The energy in which store decreases as a candle burns?
Chemical energy store
Kinetic energy store
Nuclear energy store
An aeroplane is landing. As it descends towards the runway, its speed reduces.
What are the energy changes that take place during the descent? (2013 O/N)
kinetic + gravitational → thermal (heat)
kinetic → gravitational + thermal (heat)
kinetic + thermal (heat) → gravitational
thermal (heat) → kinetic + gravitational
A car is stationary at the top of a hill with the engine switched off. The brakes are released and the car rolls down the hill.
At which labelled point does the car have the greatest kinetic energy? Ignore friction. (2015 O/N)
A
B
C
D
An Olympic high jumper, with a mass of 82 kg, has a maximum gravitational potential energy of 1970 J. How high was the jump?
Let g = 9.8N/kg
24 m
161,540 m
2.5 m
201 m
How could you increase the gravitational potential energy of an object without changing its mass and gravity?
Make the object larger
Lower the object towards the ground
Raise the object farther off the ground
Allow the object to roll on the ground
At which point does the ball has the greatest gravitational potential energy (GPE)?
A
G
D
C
G
What is the mass of a moving object that has 100 Joules of KE and moves at a velocity of 2 m/s?
50 kg
200 kg
25 kg
100 kg
What does the Law of Conservation of Energy state?
Energy cannot be created or destroyed
Nothing can exchange energy
Energy will increase over time.
Energy will decrease over time.
A 40 kg crate is picked up by a crane to a height of 50m. The crate falls. What is the velocity of the crate just before it hits the ground?
2000 Joules
19,600 Joules
19,600 m/s
31.3 m/s
Which of these is not a renewable energy
Wind
Solar
Biomass
Nuclear
Coal
Conduction is the transfer of (a) using vibrations
What is this called:
The transfer of heat through liquids and gas
(a)
Dark and dull are (a) emmiters and absorbers of radiation
One benefit of geothermal energy is that ________________________________.
a plant can be built ANYWHERE
it doesn't cost a lot of money to build
it can provide power 24 hours a day
it harms ecosystems where it's built
When energy is transferred, which store of energy aways increases?
kinetic energy
potential energy
thermal energy
mechanical energy
A solar cell is used to recharge a battery. The solar cell produces 0.80 W of electrical power.
The cell is 20% efficient.
What is the power input of the sunlight onto the solar cell?
0.16 W
4.0 W
8.0 W
16 W
What is biofuel?
A non-renewable energy source created from either a plant product or animal dung
A renewable energy source created from either a plant product or animal dung
A fuel drilled from the ground
Biofuels are always gases
An electric generator produces an electromotive force (e.m.f.) of 200 V and produces a current of 3.0 A in a circuit.
The generator is driven by an engine with a power of 2.4 kW.
What is the efficiency of the generator?
2.8%
25%
28%
36%
A 150 W filament lamp has an efficiency of 10%. A 40 W compact fluorescent lamp (CFL) has an
efficiency of 30%.
Each lamp is switched on for the same amount of time.
Which lamp produces more light and which lamp converts more energy into other forms of
energy
A
B
C
D
A lamp has a power input of 5.0 W. It wastes 1.0 W of power heating the surroundings.
What is the efficiency of the lamp?
20%
50%
80%
120%
Select two correct statements about tidal power:
Tidal power stations can be very expensive to set up
Tidal power is not used in the UK
Tidal energy will run out
The tide is used to rotate turbines to generate electricity
How do wind turbines generate electricity?
The blades spin to heat water, create steam, which turns a turbine, and produces electricity
The National Grid spins the turbines to transfer electricity to homes
Wind turbines do not generate electricity, they heat water
The blades of the wind turbine are moved by the wind, which turns a generator inside it and generates electricity
What is the greenhouse effect?
As we burn more fossil fuels, we build more greenhouses
Greenhouse gases such as carbon dioxide and methane in the earth's atmosphere absorb infra red radiation increasing the average temperature of the earth
Emissions from the burning of fossil fuels cause the sun to be hotter over time, adding to climate change
Greenhouse gases such as oxygen and nitrogen in the earth's atmosphere absorb infra red radiation increasing the average temperature of the earth
Which aspects of renewable energy electricity generation require updating the electricity transmission grid?
(I) Electricity generators are located in numerous, remote locations
(II) There is a need to transport electricity long distances
(III) There are storage problems due to the unpredictable nature of some renewables
I and II, only
I and III, only
II and III, only
III, only
I, II, and III
Which of the following is a reason why hybrid electric vehicles use less fossil fuel per mile traveled than a typical internal combustion engine vehicle uses?
Hybrid electric vehicles don’t burn fossil fuels; they run on electric energy
Hybrid vehicles are powered by the Sun using rooftop photovoltaic panels
When the brakes are applied in hybrid electric vehicles, kinetic energy is converted into electric energy to charge the batteries that assist the electric motor
Batteries in hybrid electric vehicles can be charged in the driveway overnight, when rates for electricity usage are typically low
The engines in hybrid electric vehicles are powered by biofuels made from genetically modified corn
A major limitation of using photovoltaic cells to generate electricity is that they:
Do not produce as much CO2 as other energy sources do
Do not produce as much electricity on cloudy days
Have no moving parts
Present a danger to birds and bats
Cannot be connected to the electric grid
Statement 1 : Hydrogen is used as a fuel
Statement 2 : When hydrogen burns in the air to form water, heat energy is produced
Which is correct?
Both statements are correct and statement 2 explains statement 1
Both statements are correct but statement 2 does not explain statement 1
Statement 1 is correct but statement 2 is incorrect
Statement 2 is correct but statement 1 is incorrect
Which substance does not use oxygen to produce energy?
coal
hydrogen
natural gas
uranium
Which fuel does not produce air pollution when it burns?
coal
diesel oil
hydrogen
gasoline (petrol)
A power station was designed to burn gaseous fuels only.
Which two substances could be used?
carbon dioxide and hydrogen
carbon dioxide and uranium-235
hydrogen and methane
methane and uranium-235
When the molecules of a substance vibrate faster, the
Temperature reduces
internal energy increases
internal energy decreases
molecules have lower potential energy
Which of these is not a consequence of increase of heat energy?
Expansion
Change of state
increase in temperature
Change in mass
A metal lid fits tightly on a glass jar.
Which process makes it easier to remove the lid from the jar?
cool the lid only
put the jar and lid in a refrigerator
warm the jar only
warm the lid only
A wooden wheel can be strengthened by putting a tight circle of iron around it.
Which action would make it easier to fit the circle over the wood?
Cooling the iron circle
heating the iron circle
heating the wooden wheel and cooling the iron circle
heating the wooden wheel but not heating or cooling the iron circle
A glass jug is designed so that it does not break when boiling water is poured into it. What sort of glass should be used?
A
B
C
D
The diagrams show a bimetallic strip when it is at room temperature and after it has been cooled.
The change in shape occurs because
Brass contracts more than invar
brass expands when it cools down
invar and brass contract by equal amounts
invar contracts more than brass
Three students are planning an experiment to test thermal conduction in different materials. The students each propose a hypothesis.
1 I think the copper rod will be a good thermal conductor because it is a metal.
2 I think the glass rod will be a good thermal conductor because it has free electrons which vibrate and transfer energy quickly.
3 I think the wooden rod will be a poor thermal conductor because it can only transfer energy along the rod by vibrating the lattice particles.
Which of their hypotheses are correct?
1 and 2 only
1 and 3 only
2 and 3 only
1, 2 and 3
Two square sheets of metal, P and Q, are heated to the same temperature. The metal sheets are shown. Sheet Q is emitting more radiation than sheet P. Which statement explains this?
Dull black surfaces are better conductors of radiation.
Dull black surfaces are better emitters of radiation.
The surface area of Q is larger than that of P.
White surfaces are better absorbers of radiation.
A metal rod is heated at end X. Why does end Y of the metal rod become hot?
Energy is transferred from end X of the rod to end Y by vibration of positive ions and by
movement of electrons.
Energy is transferred from end X of the rod to end Y by movement of positive ions only.
Energy is transferred from end X of the rod to end Y by vibration of positive ions only.
Energy is transferred from end X of the rod to end Y by movement of electrons only.
Which of the following would reduce the dissipation of energy from a house to the surroundings?
insulation
large walls
thin walls
metal walls
How does most insulation in the home work?
The insulating material has a vacuum that doesn't allow conduction or convection to occur
The insulating material has trapped air pockets that slows conduction and convection from occurring
All the insulating material is put at the top of the house because heat rises
All the insulating material is put in the walls because they have a large surface area
People sometimes put foil behind radiators...
...to reflect the infrared radiation back into the room
...because who wouldn't want a bit of bling behind their radiator?
..to absorb the dissipated heat
...to stop the walls getting damaged by the heat
Calculate the payback time for double glazed windows that cost £1800 to install and save £150 on heating bills
14.4 months
22.5 years
0.083 years
12 years
if you push a cart with a force of 60 N for 2 m... how much work have you done
120 J
30 J
120 N
30 N
An airplane passenger carries a 215-N suitcase up the stairs , a displacement of 4.20 m vertically and 4.60 m horizontally. How much work does the passenger do on the suitcase.
903 J
989 J
976 J
945 J
How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s?
400 W
1000 W
1600 W
4000 W
If the mass of the cart is 15kg, how much is the potential energy of the cart?
0J
1.2J
6J
58.8J
I throw my pen vertically up with 15J of kinetic energy. How much gravitational potential energy does it have at the top?
Assume no air resistance.
0J
15J
0 - 15J
Impossible to calculate
If the mystery machine moves 100 meters how much work is done?
130,000,000 J
70,000 J
100,000 J
30,000 J
If Jay pushes his van 20 meters how much work is done?
2,000 J
40,000 J
10,000 J
800,000 J
The diagram shows some rice being boiled in a pan. What is the main methods by which thermal energy is transferred (i) through the metal pan and
(ii) through the water?
(i) conduction (ii) conduction
(i) convection (ii) convection
(i) conduction (ii) convection
(i) convection (ii) conduction
Which of the following is an application of convection?
The movement of heat through a metal pan to the food.
The use of ice box to keep drinks cool.
The sea breeze that blows from sea to land.
The use of wool blanket to keep the body warm.
Which of the following correctly shows the direction of convection currents in water?
A
B
C
D
The sidewalk increases in temperature on a sunny day.
Conduction
Convection
Radiation
Warming your feet in front of a fire.
Conduction
Convection
Radiation
Hot chocolate is stirred with a spoon and the spoon gets hot.
Conduction
Convection
Radiation
