Here are some forms of energy:
chemical
heat (thermal)
kinetic
electrical
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
heat (thermal)
kinetic
electrical
light
nuclear
sound
(i) Use words from the box to complete the table.
Each word may be us... show full transcript
Worked Solution & Example Answer:Here are some forms of energy:
chemical
heat (thermal)
kinetic
electrical
light
nuclear
sound
(i) Use words from the box to complete the table - Edexcel - GCSE Physics - Question 2 - 2013 - Paper 1
Step 1
Use words from the box to complete the table.
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State what happens to the remaining electrical energy.
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Answer
The remaining electrical energy is dissipated or lost, and it usually goes into the surroundings as heat.
Step 3
Calculate how much energy is wasted in one second by the compact fluorescent lamp (CFL).
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Answer
Energy wasted = electrical energy - light energy = 20 J - 8 J = 12 J.
Step 4
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 a greater percentage of electrical energy into light energy compared to the halogen lamp. For the same input of electrical energy, the CFL produces more light energy (8 J) whereas the halogen lamp only produces 2 J. Therefore, the CFL is more efficient because it wastes less energy, meaning more of the energy supplied is converted into useful light energy.
