Energy

• How is energy similar to money?

  Energy can be stored in different places or transferred between stores.
• What type of energy is due to the motion of objects?

  Kinetic energy
• What is gravitational potential energy related to?

  How high you move something
• What is the formula for kinetic energy?

  Kinetic energy = $\frac{1}{2} MV^2$
• What does the variable V represent in the kinetic energy formula?

  Speed of the object
• In what units is mass measured for kinetic energy calculations?

  Kilograms
• What is the unit for energy?

  Joule
• What is the formula for elastic potential energy?

  Elastic potential energy = $\frac{1}{2} ke^2$
• What does the variable e represent in the elastic potential energy formula?

  Extension of the object
• What is the formula for gravitational potential energy?

  Gravitational potential energy = $mgH$
• What does the variable H represent in the gravitational potential energy formula?

  Height that something moves through
• What is the value of gravitational field strength on Earth?

  1. 8 Newtons per kilogram
• How can thermal energy be changed?

  By using the formula $MC\Delta \theta$
• What does the variable $\Delta \theta$ represent in the thermal energy formula?


  Change in temperature
• What is the unit for specific heat capacity?

  Joules per kilogram per degree Celsius
• What are the four main energy transfer processes?

  • Heating
  • Electrical working
  • Radiation (sound waves, light waves, electromagnetic spectrum)
  • Mechanical
• What is power defined as?

  The rate at which energy is transferred or work is done
• What is the formula for power?

  Power = $\frac{Energy \, transferred}{Time}$
• What is the unit for power?

  Watt
• How is efficiency calculated?

  Efficiency = $\frac{Useful \, output \, energy \, transfer}{Total \, input \, energy \, transfer}$
• What are the two main categories of energy resources?

  Non-renewable and renewable resources
• What are examples of non-renewable resources?

  Coal, oil, gas, and nuclear fuels
• What is an example of a renewable energy resource?

  Wind energy
• How do wind turbines generate electricity?

  By using the power of the wind to turn a generator
• What is the process of generating electricity using biofuels?

  Burning biofuels to generate heat that boils water, turning a turbine
• What are the different methods of generating electricity from renewable resources?

  • Wind turbines
  • Solar cells
  • Geothermal energy
  • Hydro energy
  • Wave energy
  • Tidal energy