PPQs

• Explain why people should be encouraged to use more energy efficient devices

  • So less energy is wasted
  • So you have a lower electricity bill
• why might taking the measurements more than once improve the accuracy of the results

  • a mean can be calculated
  • anomolies are identified
• what is the unit for specific latent heat

  j/kg
• suggest two reasons why models are tested before starting to build

  • asses safety risks
  • ensure the process is possible
• during student B's investigation the temperature of resistor R increased. Explain how the temperature increase would affect the results

  • Current and Pd are not directly proportional
  • because resistance increases