P1

• What are the 3 types of heat transfer?

  Conduction, radiation and convection
• What is a fossil fuel?

  A fuel produced from ancient organisms
• What colour surface is the best absorber of heat radiation?

  black
• What is the equation for efficiency?

  useful energy output/ total energy input
• What colour surface is the best emitter of heat radiation?

  black
• What is dissipated?

  Spread out wastefully
• What is the arrangement of the particles in a gas?

  Very far apart
• Conduction happens in what state of matter?

  Solid
• What is the motion of particles in a gas?

  Move very fast and randomly
• Why do hotter particles rise?

  They have a lower density than the surrounding particles
• What is thermal energy measured in?

  Joules
• What colour/surface is the worst absorber of heat radiation?

  Silver/shiny
• What is conduction?

  The transfer of thermal energy by vibration
• Which form of heat transfer involves currents?

  Convection
• What is the motion of particles in a solid?

  Vibrate
• What state of matter does convection occur?

  Fluids (liquids and gases)
• What is temperature measured in?

  degrees Celcius
• Which form of heat transfer involves the movement of particles?

  Convection
• What is the meaning of temperature?

  The average kinetic energy of the particles in a substance
• What is two insulators?

  Rubber, plastic
• What is thermal energy?

  Quantity of energy stored in a substance due to vibrations of particles
• Why are metals good thermal conductors?

  Delocalised electrons
• Which heat transfer travels in any direction?

  Conduction and radiation (heat only)
• What is the arrangement of particles in a solid?

  Close together and regular rows
• What form does the wasted energy produced by a device usually take?

  Thermal
• What heat transfer travels in one direction?

  Convection
• What is the motion of particles in a liquid?

  Flow/ move
• What is the arrangement of particles in a liquid?

  Close together/ touching and irregular pattern
• What is radiation?

  The transfer of thermal energy as a wave
• What is the opposite of a conductor?

  Insulator
• What is the opposite of an insulator?

  Conductor
• What is the conservation of energy?

  Energy cannot be created or destroyed; it can only be transferred, stored or dissipated
• Which energy transfer is involved when an object produces or absorbs sound?

  Transfer by waves
• What is 2 advantages of using fossil fuels?

  Reliable and can generate electricity on a large scale
• How can we tell which foods are energy rich?

  Compare the energy values on food labels
• What do we use energy resources for?

  To supply our energy needs
• What is 2 disadvantages of using wind power?

  Highly dependent on weather and can be noisy
• Which energy transfer is often involved in changing the temperature of objects?

  Transfer from hot to cold
• How is the energy stored in fossil fuels released?

  They are burnt
• Which energy transfer is involved in an electric circuit?

  Transfer by electric current