Energy Resources
In a fossil-fuel power station, what is the correct sequence of energy transfers from the fuel to the electrical output?
A student writes: “The generator in a power station creates electrical energy.” Which statement correctly identifies the error?
Biofuels are sometimes described as carbon-neutral. Which statement best explains this claim?
Which energy resource relies on the gravitational pull of the Moon as its primary energy source?
A tidal barrage is built across an estuary. Which form of energy does the trapped water possess at high tide, before it is released?
A geothermal power station operates in a volcanic region. Which statement correctly explains why geothermal energy is classified as renewable?
Nuclear fission in a power station uses uranium as fuel. Which row correctly identifies the type of reaction and whether the resource is renewable?
A solar cell and a solar panel are both placed on the roof of a house. Which row correctly identifies the energy output of each device?
Wind energy is classified as renewable but unreliable. Which pair of statements correctly justifies both descriptions?
A country is considering building a hydroelectric dam. A local campaigner argues that hydroelectric power has “no environmental impact because it is renewable.” State which part of this claim is incorrect and explain why. Which statement best identifies the error?
A student is asked to explain why no device can be 100% efficient. Which answer correctly explains this?
Which of the following energy resources does not originate from solar radiation?
Which statement correctly describes the process that releases energy in the Sun?
Researchers are investigating nuclear fusion as a potential source of large-scale electrical energy. Which statement correctly explains why fusion power stations do not yet operate commercially?
A light bulb receives 80 J of electrical energy and transfers 12 J to the visible light store. What is the efficiency of the bulb?
A motor has an efficiency of 60% and a total power input of 500 W. What is the useful power output?
A generator has an efficiency of 40% and produces a useful power output of 2.0 kW. Calculate the total power input to the generator.
A town needs a power source that is both renewable and highly reliable (produces electricity on demand). Which resource best meets both criteria?
Fossil fuels store chemical energy that originally came from the Sun. Which process was responsible for initially capturing solar energy in the organic material that became fossil fuels?
A solar cell receives 5000 J of light energy and has an efficiency of 16%. How much energy is transferred to non-useful thermal stores?