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In this topic we explain the energy transfers in a hand-crank torch
In this topic we explain the energy transfers in a hand-crank torch
and compare the running costs of fluorescent and filament light bulbs.
and compare the running costs of fluorescent and filament light bulbs.
By the end of this topic you should know:
By the end of this topic you should know:
How jobs get done using an energy model where energy is transferred from one store at the start to another at the end.
When energy is transferred, the total is conserved, but some energy is dissipated, reducing the useful energy.
How jobs get done using an energy model where energy is transferred from one store at the start to another at the end.
When energy is transferred, the total is conserved, but some energy is dissipated, reducing the useful energy.
We pay for our domestic electricity usage based on the amount of energy transferred.
Electricity is generated by a combination of resources which each have advantages and disadvantages.
Food labels list the energy content of food in kilojoules (kJ)
By the end of this topic you should be able to:
By the end of this topic you should be able to:
Describe how the energy of an object depends on its speed, temperature, height or whether it is stretched or compressed.
Show how energy is transferred between energy stores in a range of real-life examples.
Explain how energy is dissipated in a range of situations.
Calculate the useful energy and the amount dissipated, given values of input and output energy.
Calculate the cost of home energy usage, using the formula:
cost = power (kW ) x time (hours) x price (per kWh).
Compare the percentages of energy wasted by renewable energy sources.
Explain why processes such as swinging pendulums or bouncing balls cannot go on forever, in terms of energy.
Compare the amounts of energy transferred by different foods and activities.
Compare the energy usage and cost of running different home devices.
Explain the advantages and disadvantages of different energy resources.
Represent the energy transfers from a renewable or non-renewable resource to an electrical device in the home.
Evaluate the social, economic and environmental consequences of using a resource to generate electricity, from data.
Suggest actions a government or communities could take in response to rising energy demand.
Suggest ways to reduce costs, by examining data on a home energy bill.
By the end of this topic you should understand these key words:
By the end of this topic you should understand these key words:
Thermal energy store: Filled when an object is warmed up.
Chemical energy store: Emptied during chemical reactions when energy is transferred to surroundings.
Kinetic energy store: Filled when an object speeds up.
Gravitational potential energy store: Filled when an object is raised.
Elastic energy store: Filled when a material is stretched or compressed.
Dissipated: Become spread out wastefully.
Power: How quickly energy is transferred by a device (watts).
Energy resource: Something with stored energy that can be released in a useful way.
Non-renewable: An energy resource that cannot be replaced and will be used up.
Renewable: An energy resource that can be replaced and will not run out. Examples are solar, wind, waves, geothermal and biomass.
Fossil fuels: Non-renewable energy resources formed from the remains of ancient plants or animals. Examples are coal, crude oil and natural gas.
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