Choosing Electrical Appliances Flashcards
In the exam they may ask what appliance is most suitable to which job, what will you need to work out?
Whether one appliance uses less energy or is more cost-effective than another.
Practical advantages and disadvantages.
Battery radios and clockwork radios are both handy in what type of areas?
There is no mains electricity supply.
How do clockwork radios work?
By storing elastic potential energy in a spring when someone winds them up.
The elastic potential energy is slowly released and used to power the radio.
What is a con about battery radios?
Batteries are expensive, but powering a clockwork radio is free.
When are battery radios only useful?
If you get a hold of new batteries when the old ones run out.
What is a con about clockwork radios?
Can get annoying when you have to keep winding them up every few hours to recharge them.
What is a pro about clockwork radios?
They are better for the environment.
Harmful chemicals go into making batteries, tricky to dispose safely.
How is standard of living affected?
By access to electricity.
What do people have access to in developed countries?
Mains electricity.
In the UK, what are our houses full of?
Devices that transform electrical energy into other useful types of energy.
How are refrigerators good?
Keep food fresh, slow down growth of bacteria.
Keep vaccines cold.
How does electricity play an important role in public health care?
Hospitals in developed countries rely on electricity for x-ray machines.
Without access to these modern facilities the diagnosis and treatment of patients would be poorer and could reduce life expectancy.
