1.8 electrical appliances

Question 1

How is the energy used in your home supplied?

Answer 1

By electricity, gas and oil

Question 2

Light bulb useful and wasted energy

Answer 2

Useful: light emitted from the glowing filament
Wasted: heat

Question 3

Electric heater useful and wasted energy

Answer 3

useful: heat
wasted: light

Question 4

electric toaster useful and wasted

Answer 4

useful: heat
wasted: heating the toaster case and air around it

Question 5

hairdryer useful and wasted

Answer 5

useful: kinetic energy of air driven by fan, energy heating air flowing past heater filament
wasted: sound of fan motor, energy heating hairdryer itself

Question 6

electric motor useful and wasted

Answer 6

useful: kinetic energy of objects driven by motor, gpe of objects lifted by the motor
wasted: energy heating the motor, energy transferred by the sound waves generated by the motor