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PHY* CE 06 Q.11 問題,,,, 急* (internal resistance)

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Answer:(1) When the resistance of R is reduced, the total current will increase. (2) The voltage drop due to internal resistance of the dry cells increases. (3) The voltage across of the bulb decreases. As a result, the brightness of the bulb decreases.第(1)個point我明,,,但係唔係好明第(2)個point,,,,,,點解internal... 顯示更多 Answer: (1) When the resistance of R is reduced, the total current will increase. (2) The voltage drop due to internal resistance of the dry cells increases. (3) The voltage across of the bulb decreases. As a result, the brightness of the bulb decreases. 第(1)個point我明,,,但係唔係好明第(2)個point,,,,,, 點解internal resistance會increase??? 有冇人可以幫下我呀,,,,, thanks* 更新: TO: ＬＬ＊～／ 咁係咪姐係當TOTAL CURRENT增加,, 個CELL就會受到多D熱力,, INTERNAL RESISTANCE跟住增加???? THZZZ*

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最佳解答:

internal resistance increases with temperature~ when there this a current flow in the circuit, the current will heat up the resistor and thus the resistance of resistor increases , just the same as the internal resistance of cell. imagine that there is a small resistor inside the cell

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