Transferring Electrical Energy Worksheet Page 36
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46(b)
toaster
accept 1.2 kW
1
(c)
(i)
400
1
(ii)
£24 or 2400p
full credit for their (c)(i) × 6p for full credit the correct numerical
answer must have the correct unit
an answer of 24 or 2400 with no unit or the incorrect unit scores 1
mark
(c)(i) × 6 incorrectly evaluated scores 1 mark
2
(d)
6
allow 6000 for 1 mark
allow 3 × 2 for 1 mark
2
[9]
M9.
(a)
(i)
heat
1
(ii)
temperature increases or (cause) convection (currents)
accept gets warmer
accept gets hotter
1
(iii)
60% or 0.6
60 without % scores 1 mark
0.6 with a unit scores 1 mark
60 with incorrect unit scores
1 mark
or correct substitution
for 1 mark
2
(b)
street
1
more (energy transferred as) light or less (energy transferred as) heat or useful
energy output the highest
can only score this mark if first mark scored
all efficiencies calculated correctly score 2nd mark point
1
[6]
Page 36 of 46
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