1.7.3. Energy resources
A subsection of Physics, 5054, through 1. Motion, forces and energy
Listing 10 of 46 questions
is a block diagram of a power station. The four boxes represent different parts of the power station. The first box is labelled boiler. oil boiler electrical energy output Each of the other three boxes should contain one of the labels from the following list. generator, motor, transformer, turbine, solar panel On , label the boxes using words from the list. State one environmental problem caused by burning oil to produce electricity. Oil is a non-renewable energy source. State why oil is described as a non-renewable energy source. State one renewable energy source.
5054_s08_qp_2
THEORY
2008
Paper 2, Variant 0
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shows part of a small hydroelectric system that generates electricity from moving water. generator turbine water pipe Every minute, water with kinetic energy 14 000 J emerges from the pipe. The water turns a turbine that is connected to the generator. Half of the kinetic energy of the water is given to the generator. Calculate the power input to the generator. power = Suggest a reason why only some of the kinetic energy of the water is given to the generator. Hydroelectric systems use sources of renewable energy. State what is meant by renewable energy. State one source of non-renewable energy.
5054_s11_qp_21
THEORY
2011
Paper 2, Variant 1
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Different energy sources are used to generate electricity. Energy sources are renewable or non-renewable. Nuclear energy is described as a non-renewable source. Explain what is meant by a non-renewable energy source. Four of the energy sources used are: hydroelectric oil geothermal wind Write the name of these energy sources in the correct column of the table below. non-renewable renewable and caused by energy from the Sun renewable and not caused by energy from the Sun State one way in which using nuclear energy is better for the environment than using oil. State one way in which using nuclear energy is worse for the environment than using oil. is a block diagram of a power station that produces electrical energy from oil. electrical energy output fuel energy input from oil thermal energy internal energy of steam turbine boiler burner Write the name of the missing part of the power station in the empty box on . State the form of energy that the turbine possesses. A small boiler in the power station contains 24 m3 of water at 30 °C. High pressure in the boiler increases the boiling point of water to 120 °C. Thermal energy supplied to the boiler is used to heat the water from 30 °C to 120 °C and then to turn it all to steam at 120 °C. The density of water is 1000 kg / m3. The specific heat capacity of water is 4200 J / (kg °C). The specific latent heat of vaporisation of water is 2.3 × 106 J / kg. 1. Calculate the mass of water in the boiler. mass = 2. Calculate the total thermal energy supplied to the boiler. thermal energy = The electrical energy output from the power station is transmitted over long distances at a high voltage. Explain why electricity is transmitted at a high voltage.
5054_s17_qp_21
THEORY
2017
Paper 2, Variant 1
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Questions Discovered
46