© Oxford University Press 2011 IP1.14.4 Pairs of devices Pairs of devices.

© Oxford University Press 2011

IP1.14.4 Pairs of devices

Pairs of devices



Different types of electrical devices have advantages and disadvantages. Look at pairs of devices on the following screens

and think of one advantage and one disadvantage for each of them.



Battery-powered radio

Wind-up radio



Advantage Disadvantage

Battery-powered

radio

Will run on its own

Batteries will need to be replaced

Wind-up radio

Costs nothing to run

Need to wind it up regularly



High power electric heaterLow power tubular heater




High power electric heater

Gives off more heat

Not suitable for small spaces

Low power tubular heater

Can be installed in small spaces

Generates only low background heat



Standard light bulb

Energy saving light bulb




Standard light bulb

Cheaper to buy Not energy efficient

Energy saving light

bulb

Less energy is wasted as heat

More expensive to buy



Electric oven

Microwave oven




Electric oven

More versatile for cooking

Takes longerto cook

Microwave oven

Cooks quickly and uses

less energy

Can’t cook much in one go

© Oxford University Press 2011 IP1.14.4 Pairs of devices Pairs of devices.

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