Transferring Electrical Energy Worksheet Page 40
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46(c)
(i)
any one from:
answers must be a comparison
•
holds more water
do not accept 1 litre of water on its own
•
works in other countries
accept a named country
accept works at 2 voltages
•
boils faster
•
has a more powerful element
do not accept 1 kW element on its own
•
can filter water
1
ignore can wash filter
(ii)
any one from:
•
it weighs less
•
smaller to pack
•
cheaper to use
answers must be a comparison
or state why the chosen feature is an advantage
accept boils enough for one drink
1
[8]
M15.
(a)
(i)
0.6
accept 60 %
allow 1 mark for useful energy = 480
answer 0.6 with any unit or 60 gains 1 mark only
2
(ii)
transferred to surroundings
accept goes into the air
accept heats the surroundings up
accept gets spread out
accept transferred into heat (only)
do not accept wasted / lost unless qualified
destroyed negates mark
transferred into light / sound negates mark
1
(b)
(i)
1.75
allow 1 mark for converting to kW
answers of 0.7, 0.525, 0.35, 0.875, 1.05, 5.25 gains 1 mark
answers of 1750 or 17.5 gains 1 mark
2
Page 40 of 46
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