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
Use words from the box to complete the table.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
State what happens to the remaining electrical energy.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
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).
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Energy wasted = 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.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
The CFL lamp uses the same amount of electrical energy (20 J) but produces more useful light energy (8 J) compared to the halogen lamp. This means that the CFL is more efficient, wasting less electrical energy as heat.
