Electrical Energy Flashcards
What are four common electrical appliances
Lamps- produce light
Electric mixers- produce kinetic energy
Speakers- produce sound energy
Television- produce light and sound energy
Why are electrical appliances extremely useful
Because they can transfer electrical energy into whatever form of energy we need
What are the useful energy transfers in an electric drill
Electrical; kinetic
Which electrical appliance usually transfers electrical energy; light; sound
TV or computer
What is the power of an appliance
The rate at which it transfers
What is the unit for power
Watts
What is energy used measured in
The amount is measured in kilowatt-hours
What is a kilowatt hour
The amount of energy transferred by one kilowatt appliance when used for one hour
What are the things we take into account when talking about cost effectiveness
- cost of buying appliance
- cost of installing the appliance
- running cost
- maintenance cost
- environmental cost
- interest charged do buy the appliance
What might environmental cost include
The removal or disposal of old equipment and environmental taxes
What is payback time
The time it takes for an appliance to pay for itself I. Terms of energy saving
Loft insulation costs £600 Including installation. It saves £80 per year, how long in payback time
7.5 years
What are the ways that a home can lose energy
Throughout the: Walls Windows Roof Floor In draughts
How is most energy in a home lost
Walls
Where is the least amount of energy lost in a home
Windows 10%
