What you’ll learn7 learning objectivesChoose one objective for a focused lesson, or study the complete topic.1.7.3.1Energy/electrical power sources: (a)• Describe useful energy/electrical power sources: (a) fossil fuels (b) biofuels (c) water: waves, tides and hydroelectric dams (d) geothermal resources (e) nuclear fuel (f) sunlight for solar cells (g) infrared/other EM waves for solar water heating and wind energy, including boilers, turbines and generators where usedSyllabus objective1.7.3.2Advantages and disadvantages of each• Describe advantages and disadvantages of each method in terms of renewability, availability, reliability, scale and environmental impactSyllabus objective1.7.3.3Understand, qualitatively, the concept• Understand, qualitatively, the concept of efficiency of energy transferSyllabus objective1.7.3.4Radiation from the Sun is the main• Know: radiation from the Sun is the main source of energy for all our energy resources except geothermal, nuclear and tidalSyllabus objective1.7.3.5Energy is released by nuclear fusion• Know: energy is released by nuclear fusion in the SunSyllabus objective1.7.3.6Research is being carried out to• Know: research is being carried out to investigate how energy released by nuclear fusion can be used to produce electrical energy on a large scaleSyllabus objective1.7.3.7Efficiency: (a) efficiency = useful• Define and use efficiency: (a) efficiency = useful energy output / total energy input × 100% (b) efficiency = useful power output / total power input × 100%Syllabus objective