Here are some forms of energy:
chemical elastic potential electrical
heat (thermal) kinetic light
nuclear sound
(i) Use words from the box to complete the table - Edexcel - GCSE Physics - Question 2 - 2013 - Paper 1
Question 2
Here are some forms of energy:
chemical elastic potential electrical
heat (thermal) kinetic light
nuclear sound
(i) Use words from the box to comple... show full transcript
Worked Solution & Example Answer:Here are some forms of energy:
chemical elastic potential electrical
heat (thermal) kinetic light
nuclear sound
(i) Use words from the box to complete the table - Edexcel - GCSE Physics - Question 2 - 2013 - Paper 1
Step 1
Energy transferred from... (i)
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What happens to the remaining electrical energy? (ii)
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Answer
The remaining electrical energy is dissipated as heat or lost to the surroundings.
Step 3
Calculate how much energy is wasted in one second by the compact fluorescent lamp (CFL). (i)
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Answer
Energy wasted = Total energy - Useful energy output = 20 J - 8 J = 12 J.
Step 4
Explain why the CFL lamp has a better efficiency rating than the halogen lamp. (ii)
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Answer
The CFL lamp provides a greater output of light energy for the same input of electrical energy, resulting in less wasted electrical energy compared to the halogen lamp, which results in a lower efficiency rating.
