Physics topic 3: Heating

• Latent heat

  The energy required or released when one kilogram of a substance changed state
• Equation for power using voltage

  Power = Voltage x current
• Equation for work done

  Work done = Voltage x current x time
• Required practical method for Specific Heat Capacity

  Record the mass of the aluminium block

  Place and secure the insulation (foam) around the block

  Place a heater in the large hole

  Connect the ammeter, power pack and heater in seriers

  Connect the Voltmeter in parallel

  Use a pipette and put a small amount of water in the small hole

  Put themometer in this hole

  Turn on power pack - turns on heater

  Record ammeter and voltmeter readings

  Calculate power on the heater

  Measure temperature every minute for 10 minutes and record
• Change in energy = Mass x Latent heat
• Change in energy (With SHC)

  Change in energy = Mass x Specific heat capacity x Change in temperature
• Internal energy


  The energy of the particles that is caused by their individual motions and positions
• Internal energy is the sum of

  Kinetic energy - due to their individual motions

  Potential energy - they have due to individual positions relative to each other