ELECTRICAL APPLIANCES

Question 1

what is the energy used in your home mostly supplied from?

Answer 1

electricity, gas and oil

Question 2

what is electricity?

Answer 2

it’s the flow of charge that transfers energy from one energy store to the another

Question 3

light bulb

Answer 3

• light emitted from the glowing filament

- energy transfer from the filament heating the surroundings

Question 4

electric heater

Answer 4

• energy heating the surroundings

- light emitting from the glowing element

Question 5

electric toaster

Answer 5

• energy heating bread

- energy heating the toaster case and the air around it

Question 6

electric kettle

Answer 6

• energy heating water

- energy heating the kettle itself

Question 7

hair dryer

Answer 7

• Ek of the air driven by the fan
• energy heating heating air flowing past the heater filament
• sound of motor (energy heating the motor heats the air going past it, so is not wasted)
• energy heating the hair dryer itself

Question 8

electric motor

Answer 8

• Ek energy of objects driven by the motor
• Ep of objects lifted by the motor
• energy heating the motor and energy transferred by the sound waves generated by the motor

Question 9

Trevor Baylis (early 1900s) - clockwork radio

Answer 9

turn the hand which winds up a clockwork spring in it and increases the Ee of the spring
-when it unwinds the energy from the Ee is transferred to its Ek store and it turns a small electric generator in the radio

• no battery or main electricity needed
• can be used by people with no access to main electricity and batteries
• can manually store energy by winding up the spring every time