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標題: [學術探討] 會考物理 [打印本頁]

作者: 真田 時間: 2009-1-2 17:20 標題: 會考物理

點搞

When a nichrome wire of length L and diameter d is connected to a dry cell, the current flowing through the wire is 0.6A. If another nichrome wire of length 3L and diameter 2d is connected to the same cell, what will be the current flowing throuh wire?

A. 0.3A
B. 0.8A
C. 1.2A
D. 1.8A

點計個答案係B?

仲有

A series of 20 light bulbs each has a rating of "11V, 4w" is connected to a 220V power supply. One of the bulbs burns out. Kenneth replaces it with a new bulb, which is also marked 4W. But the new bulb appears dimmer than the other bulbs. Which of the following statements are correct?

(1) The resistence of the news bulb is lower than that of the other bulbs.
(2) The voltage across the new bulb is less than that across eact of the other bulbs.
(3) The new bulb is designed to work at a low voltage.

A. (1) and (2)
B. (1) and (3)
C. (2) and (3)
D. (1), (2) and (3)

點計個答案係D?

唔該晒

[ 本帖最後由真田於 2009-1-4 14:12 編輯 ]

作者: 小軒 時間: 2009-1-2 17:52

Marking睇左未

沖完涼計計

作者: 真田 時間: 2009-1-2 17:58

QUOTE:

原帖由小軒於 2009-1-2 17:52 發表
Marking睇左未

沖完涼計計

我果本係學校借番黎類似參考書既MC練習
但係唔知點解本solution比人抽起左
所以冇step睇

作者: m11 時間: 2009-1-2 23:20

話說第1條out c?

第2條中文希望

作者: 小軒 時間: 2009-1-3 10:23

QUOTE:

原帖由 m11 於 2009-1-2 23:20 發表
話說第1條out c?

第2條中文希望

唔怪得我計唔到啦

作者: 真田 時間: 2009-1-4 14:10 標題: 回復 #4 m11 的帖子

一定冇out

作者: 真田 時間: 2009-1-4 14:13

其實我應該算係解到
不過都唔該晒兩位

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