Gr 9 NATURAL SCIENCES: CH 3.6 Electricity generation

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Questions and Answers

What is the primary method of generating electricity in power stations?

  • Producing continuous power
  • Burning fossil fuels
  • Converting mechanical energy into electrical energy
  • Converting different forms of energy into electrical energy (correct)

What is the function of a turbine in a coal-powered power station?

  • To convert different forms of energy into electrical energy
  • To generate steam
  • To push the blades of a generator
  • To convert mechanical energy into electrical energy (correct)

What is the purpose of pulverization in a coal-powered power station?

  • To burn coal more efficiently
  • To generate steam
  • To crush large chunks of coal into a fine powder (correct)
  • To convert mechanical energy into electrical energy

What is the main disadvantage of using coal as an energy source?

<p>It contributes to environmental pollution and climate change (C)</p> Signup and view all the answers

What is the function of a generator in a coal-powered power station?

<p>To convert mechanical energy into electrical energy (B)</p> Signup and view all the answers

What is the purpose of combustion in a coal-powered power station?

<p>To burn coal (A)</p> Signup and view all the answers

What is transmitted through power lines in a coal-powered power station?

<p>Electricity (C)</p> Signup and view all the answers

What type of energy source is coal?

<p>Non-renewable (B)</p> Signup and view all the answers

What is the purpose of steam generation in a coal-powered power station?

<p>To boil water (C)</p> Signup and view all the answers

What is an alternative energy source?

<p>Sources of energy that are not derived from fossil fuels (C)</p> Signup and view all the answers

What is the primary function of a hydroelectric power plant?

<p>To convert the potential energy of stored water into electricity (B)</p> Signup and view all the answers

What is a major advantage of wind power?

<p>Low operational costs (B)</p> Signup and view all the answers

What is the primary challenge of solar power?

<p>Intermittent energy supply (D)</p> Signup and view all the answers

What is geothermal energy used for?

<p>To generate electricity from the Earth's interior (B)</p> Signup and view all the answers

What is the primary purpose of a portable generator?

<p>To provide power during outages (B)</p> Signup and view all the answers

What is a characteristic of renewable energy sources?

<p>Renewability (C)</p> Signup and view all the answers

What is biomass energy used for?

<p>To generate electricity through combustion or anaerobic digestion (B)</p> Signup and view all the answers

What is the Faraday Disk used for?

<p>To demonstrate electromagnetic induction (B)</p> Signup and view all the answers

What is a benefit of using alternative energy sources?

<p>Lower environmental impact (C)</p> Signup and view all the answers

What is a common challenge faced by wind power and solar power?

<p>Variable energy supply (C)</p> Signup and view all the answers

What is the primary source of energy for hydroelectric power plants?

<p>Stored water (B)</p> Signup and view all the answers

What is a common challenge shared by wind and solar power?

<p>Variable energy supply (B)</p> Signup and view all the answers

What is the purpose of photovoltaic cells in solar power generation?

<p>To convert sunlight into electricity (B)</p> Signup and view all the answers

What is the primary advantage of biomass energy?

<p>It is renewable (A)</p> Signup and view all the answers

What is the primary function of a turbine in a hydroelectric power plant?

<p>To convert kinetic energy into electricity (D)</p> Signup and view all the answers

What is a characteristic of sustainable energy sources?

<p>They are renewable (C)</p> Signup and view all the answers

What is the primary purpose of portable generators?

<p>To provide backup power during outages (C)</p> Signup and view all the answers

What is an advantage of hydroelectric power plants?

<p>They produce no emissions during operation (C)</p> Signup and view all the answers

What is the primary advantage of wind power?

<p>It has low operational costs (D)</p> Signup and view all the answers

What is geothermal energy used for?

<p>To generate electricity (D)</p> Signup and view all the answers

What is the primary function of a power station?

<p>To facilitate the generation of electrical power (A)</p> Signup and view all the answers

What is the purpose of the turbine in a coal-powered power station?

<p>To convert mechanical energy into electrical energy (C)</p> Signup and view all the answers

What is the environmental impact of the reliance on coal as an energy source?

<p>It results in habitat destruction, environmental pollution, greenhouse gas emissions, and climate change (B)</p> Signup and view all the answers

What is the purpose of steam generation in a coal-powered power station?

<p>To boil water to generate steam (D)</p> Signup and view all the answers

What is the function of a generator in a coal-powered power station?

<p>To convert mechanical energy into electrical energy (A)</p> Signup and view all the answers

What is the primary characteristic of coal as an energy source?

<p>It is a non-renewable energy source (A)</p> Signup and view all the answers

What is the purpose of combustion in a coal-powered power station?

<p>To generate steam from burning coal (D)</p> Signup and view all the answers

What is the primary function of a power station in South Africa?

<p>To generate electricity from coal (A)</p> Signup and view all the answers

What is the purpose of pulverization in a coal-powered power station?

<p>To crush coal into a fine powder (D)</p> Signup and view all the answers

What is the final step in a coal-powered power station?

<p>Transmission of generated electricity (C)</p> Signup and view all the answers

What is the primary source of energy for hydroelectric power plants?

<p>Stored water (D)</p> Signup and view all the answers

What is the primary advantage of wind power?

<p>Low operational costs (A)</p> Signup and view all the answers

What is the primary purpose of photovoltaic cells in solar power generation?

<p>To convert sunlight directly into electricity (B)</p> Signup and view all the answers

What is the primary characteristic of renewable energy sources?

<p>Can be replenished naturally (D)</p> Signup and view all the answers

What is the primary function of a turbine in a hydroelectric power plant?

<p>To turn generators to produce electricity (C)</p> Signup and view all the answers

What is the primary challenge faced by solar power?

<p>Intermittent energy supply (D)</p> Signup and view all the answers

What is the primary purpose of portable generators?

<p>To generate electricity during power outages (C)</p> Signup and view all the answers

What is the primary benefit of using alternative energy sources?

<p>Lower environmental impact (B)</p> Signup and view all the answers

What is the primary advantage of biomass energy?

<p>Renewable and sustainable (C)</p> Signup and view all the answers

What is the primary characteristic of sustainable energy sources?

<p>Lower environmental impact (D)</p> Signup and view all the answers

What is the main purpose of a power station?

<p>To convert different forms of energy into electrical energy (B)</p> Signup and view all the answers

What is the result of burning coal in a furnace?

<p>Production of steam (B)</p> Signup and view all the answers

What is a common characteristic of alternative energy sources?

<p>They are not derived from fossil fuels (C)</p> Signup and view all the answers

What is the role of a turbine in a coal-powered power station?

<p>To convert mechanical energy into electrical energy (B)</p> Signup and view all the answers

What is the environmental impact of the reliance on coal as an energy source?

<p>It contributes to environmental pollution and climate change (B)</p> Signup and view all the answers

What is the purpose of a generator in a coal-powered power station?

<p>To convert mechanical energy into electrical energy (A)</p> Signup and view all the answers

What is the primary energy source used in South Africa for electricity generation?

<p>Coal (D)</p> Signup and view all the answers

What is the process of converting mechanical energy into electrical energy?

<p>Electrical generation (D)</p> Signup and view all the answers

What is the final product of a coal-powered power station?

<p>Electricity (C)</p> Signup and view all the answers

What is the purpose of pulverization in a coal-powered power station?

<p>To crush large chunks of coal into a fine powder (C)</p> Signup and view all the answers

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