KS3 Energy

• What are the different types of energy stores mentioned?

  Chemical, thermal, kinetic, gravitational potential, elastic potential
• What is chemical energy stored in?

  Food and fuels
• What is thermal energy stored in?

  Hot objects
• What is kinetic energy stored in?

  Moving objects
• How does height affect gravitational potential energy?

  The higher the object, the more energy stored
• What is elastic potential energy?

  Energy stored in compressed or stretched objects
• What happens to a spring when it is compressed?

  It stores elastic potential energy
• What does the law of conservation of energy state?

  Total energy before equals total energy after
• What occurs during energy transfers?

  Energy can be transferred between different stores
• What happens to chemical energy when heating water on a stove?

  It decreases while thermal energy increases
• What is wasted energy during heating?

  Heat energy transferred to the surroundings
• How does wasted energy affect surroundings?

  It causes the surroundings to heat up
• What are the ways to transfer energy mentioned?

  • Electrical
  • Sound
  • Light
• What is the significance of wasted energy in appliances?

  It indicates inefficiency in energy use
• What are non-renewable resources?

  Resources that will run out
• Which resources are considered non-renewable?

  Coal, oil, gas, and nuclear
• How is coal formed?

  From fossilized remains of dead plants
• What is the process of forming oil and gas?

  From fossilized remains of sea creatures
• Why are fossil fuels considered non-renewable?

  They take millions of years to form
• What happens in a power station using fossil fuels?

  Fuels are burned to generate electricity
• What is needed to generate electricity in a power station?

  A turbine that turns a generator
• How does a fossil fuel power station generate electricity?

  By heating water to create steam
• What is the role of steam in a fossil fuel power station?

  It turns the turbine to generate electricity
• What is released by power stations that causes global warming?

  Carbon dioxide
• What are the disadvantages of fossil fuel power stations?

  They release harmful pollutants and are non-renewable
• What are renewable energy resources?

  Resources that will not run out
• How is biofuel produced?

  • Grow plants
  • Harvest them
  • Burn them in power stations
• Why is biofuel considered carbon neutral?

  It releases CO2 taken in during growth
• What is geothermal energy?

  Heat from hot rocks underground
• How does geothermal energy generate electricity?

  By pumping water underground to create steam
• What drives the turbine in wind energy generation?

  The wind
• What is a disadvantage of wind energy?

  It is not always windy
• How does hydroelectric energy work?

  Using falling water to turn a turbine
• What is wave energy?

  Energy generated by the movement of waves
• What is a disadvantage of wave energy?

  It relies on the presence of waves
• How does tidal energy generate electricity?

  Water flows through turbines as tides change
• What is a benefit of tidal energy?

  It is very reliable due to predictable tides
• How do solar panels generate electricity?

  By absorbing energy from the Sun
• What is a disadvantage of solar energy?

  It is not reliable during cloudy days
• What are the key features of renewable energy sources?

  • They will not run out
  • They produce less pollution
  • They can be harnessed in various ways