# Physics Wasted Energy Question Help (GCSE)

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#1
Can you help me in the question below please?
0
#2
(Original post by Hello50)
Can you help me in the question below please?
How would I get the answer 1.8 p
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#3
(Original post by Hello50)
How would I get the answer 1.8 p
p.s. it's an AQA P1 question
0
4 years ago
#4
1 mark for correct transformation and substitution into efficiency equation ie 0.8 × 1200 – useful power

1 mark for useful power = 960 W / 0.96 kW

1 mark for waste energy transferred = 0.24 × 0.5 or waste energy transferred = 0.12 (kWh)

1 mark for 1.8p
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#5
(Original post by IDontEvenGoHere)
1 mark for correct transformation and substitution into efficiency equation ie 0.8 × 1200 – useful power

1 mark for useful power = 960 W / 0.96 kW

1 mark for waste energy transferred = 0.24 × 0.5 or waste energy transferred = 0.12 (kWh)

1 mark for 1.8p
Where did you get 0.24 from? Thanks
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#6
(Original post by Hello50)
Where did you get 0.24 from? Thanks
Does anyone know how to get the 0.24?
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4 years ago
#7
(Original post by Hello50)
Where did you get 0.24 from? Thanks
After you've calculated the useful energy, which is 0.96

we know that the energy used is 1.2
therefore the energy wasted would be 1.2-0.96 which is 0.24
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#8
(Original post by IDontEvenGoHere)
After you've calculated the useful energy, which is 0.96

we know that the energy used is 1.2
therefore the energy wasted would be 1.2-0.96 which is 0.24
Thanks
0
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