Power

• What does power represent in electrical appliances?

  Energy transferred in a certain time
• How is power calculated?

  Power = Energy / Time
• How can you calculate energy transferred by an appliance?

  Energy = Power × Time
• What does a higher power rating indicate about an appliance?

  More energy transferred in a given time
• How do energy companies measure energy usage?

  In kilowatt hours
• What is one kilowatt equal to in watts?

  1,000 watts
• Why do energy companies prefer kilowatt hours over joules?

  For easier calculation over long time periods
• How can you save energy when using appliances?

  Choose lower power rating appliances
• How does lower power affect energy usage over time?

  Less energy is used over time
• What is one way to reduce heating costs in a house?

  Insulate your house
• What are methods to insulate a house?

  • Cavity wall insulation
  • Loft insulation
  • Draught excluders
  • Double glazing
• What is the relationship between power and energy usage?

  Higher power means more energy used
• How does using appliances for shorter times affect energy consumption?

  It reduces overall energy consumption
• What does power measure in electrical energy?

  How fast electrical energy is converted
• What types of energy can electrical energy be turned into?

  Heat or light