(a) What is meant by saying that the potential difference between two points is 1 volt? Name a device that helps to measure the potential difference across a conductor.
(b)Why does the connecting cord of an electric heater not glow hot while the heating element does?
(c) Electrical resistivities of some substances at 20°C are given below Silver
1.60 × 10−8 Ωm
Copper
1.62 × 10−8 Ωm
Tungsten
5.20 × 10−8 Ωm
Iron
10.0 × 10−8 Ωm
Mercury
94.0 × 10−8 Ωm
Nichrome
100 × 10−6 Ωm
Answer the following questions in relation to them
(i) Among silver and copper, which one is a better conductor? Why?
(ii) Which material would you advise to be used in electrical heating devices? Why?
Answers
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0
Answer:
the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.
Answered by
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Answer:
5.20 × 10-8 = 44
Explanation:
44 is correct answer
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