EVERYDAY SCIENCE - ELECTRICITY
Question 1

While on a summer vacation in Japan, Ace noticed overhead power line around the city. These power lines are commonly used to transmit electricity. He observed that the wires are hung loosely.

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Answer 1

Fill in the blanks with the keywords provided below.
[contract] • [breaks] • [still remain] • [lose heat] • [tighter] • [colder] • [flow through] • [air]

a) Japan experiences seasonal weather with hot summers and cold winters. Explain what would happen in winter if the power lines were not hung loosely.

Answer:

The power lines will to the surrounding and . The power lines will be stretched and may snap.


b) Ace also observed that multiple power lines run in parallel to each other. What is the advantage of such a parallel arrangement?

Answer:

If one power line , electric current can still the other power lines.
If there is a blackout in one city area, other areas will powered.




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“As of 2017, only 7% of power cables in central Tokyo are underground. This is vastly different from Singapore, where over 90% of power lines are subterranean. In preparation for the 2020 Tokyo Olympics, the Japanese government intends to bury power lines underground to beautify the city.”