4. Which element is used to make filaments of
electric bulb and why?
5. State what happens when electric charges flow
throat
Answers
Answer:
Tungsten is used for making filament of an electric bulb due to the following reasons: Being an alloy it has a very high melting point. It has very high resistivity so it does not burn easily at room temperature
Answer:
The potential difference between two points in an electric circuit is 1 volt. What does it mean?
Name a device that helps to measure the potential difference across a conductor.
(ii) Why does the connecting cord of an electric heater not glow while the heating element does?
(iii) Element resistivities of some substances at 20
∘
C are given below:
Silver 1.60×10
−8
Ωm
Copper 1.62×10
−8
Ωm
Tungster 5.2×10
−8
m
Iron 10.0×10
−8
2m
Mercury 94.0×10
−8
Ωm
Answer the following questions using above data:
(a) Among silver and copper, which one is a better conductor? Why?
(b) Which material would you advise to be used in electrical heating devices and why?
Explanation:
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