18 Questions
What is the term for the transfer of energy between different stores?
Energy transfer
What is the ratio of the useful energy output to the total energy supplied?
Efficiency
What type of energy transfer occurs when a fire is used to heat up an object?
Heating
What is the purpose of a Sankey diagram?
To represent the transfer of input energy into useful energy and wasted energy
What is the method of heat transfer in solids and liquids?
Conduction
What is the principle that states that the total energy before is equal to the total energy after?
Conservation of energy
What is the formula for calculating power?
P = W / t
What is the main advantage of renewable energy sources?
They have a potentially infinite energy supply
What is a disadvantage of fossil fuels?
They release greenhouse gases that cause global warming
What is an example of a renewable energy source?
Hydroelectricity
What is a characteristic of nuclear power?
A small amount of radioactive material produces a lot of energy
What occurs during the generation of electricity?
Energy is transferred
What is the characteristic of a surface that makes it a good absorber and emitter of infrared radiation?
Dull texture
What is the relationship between the surface area of a body and the amount of infrared radiation it emits?
The larger the surface area, the more radiation it emits
What is the formula for calculating the gravitational potential energy of an object?
E_p = m × g × h
What is the definition of power in terms of energy and time?
Power is the rate at which energy is transferred
What is the formula for calculating the work done on an object?
W = F × d
What is the purpose of a shiny surface in reducing unwanted energy transfer?
To reflect radiation and reduce energy transfer
Learn about the concept of power, energy resources, and renewable energy sources such as wind, water, geothermal, and solar power.
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