Physics Paper 1 overview

• What is power?

  The rate of energy transfer
• What does Non-Renewable mean?

  We cannot replace the resource as quickly as we use it.
• How do we reduce unwanted energy transfer?

  Lubrication or insulation
• What does renewable mean?

  We can replace the resource as quickly as we use it
• What is specific heat capacity?

  The amount of energy needed to raise the temperature of 1kg of a material by 1oC
• When is energy transferred mechanically?

  When force moves an object through a distance
• When a system changes, what happens to energy?

  The way energy is stored changes
• What is the earth wire used for?

  Safety wire - Stops the appliance becoming live
• Is mains electricity ac or dc?

  Ac
• What is the live wire used for?

  Providing the alternating potential difference
• What is the neutral wire used for?

  Completes the circuit
• What happens to the resistance of an LDR as light intensity increases?

  Decreases
• What happens to the resistance of a filament bulb as temperature increases?

  Increases
• What affect does adding resistance have in a parallel circuit?

  Reduces total resistance
• Describe voltage in a parallel circuit

  Same everywhere
• What is resistance?

  Anything that slows down the flow of charge
• Describe current in a parallel circuit

  Shared
• What is current?

  Flow of electrical charge
• Describe voltage in a series circuit

  Shared|
• Describe current in a series circuit

  Same everywhere
• What is the total resistance in a series circuit?

  Sum of the resistance of all components