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 complete the ta... 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
(i) Use words from the box to complete the table.
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(ii) In the electric motor only some of the electrical energy is transferred into kinetic energy. State what happens to the remaining electrical energy.
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Answer
The remaining electrical energy is dissipated as heat energy, which means it is lost to the surroundings.
Step 3
(b)(i) Calculate how much energy is wasted in one second by the compact fluorescent lamp (CFL).
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(b)(ii) Use the energy transfer diagrams to explain why the CFL lamp has a better efficiency rating than the halogen lamp.
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Answer
The CFL lamp converts 8 J of electrical energy into useful light energy, whereas the halogen lamp converts less of the 20 J input into light energy. This means the CFL has a greater output of light energy for the same input, making it more efficient.
