英语问题懂的进来拿分 12.A flashlight bulb uses 8.4 W of power when the

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英语问题懂的进来拿分 12.A flashlight bulb uses 8.4 W of power when the the current in the bulb
12.A flashlight bulb uses 8.4 W of power when the the current in the bulb is 0.6 A.What is the voltage difference?What is the resistance of the flashlight circuit?
.How many neutrons and pro tons are in an atom of phosphorus-31,atomic number 15,and determine how many electrons should be in the first,second,third,and fourth energy levels?

一个闪灯由8.4瓦电源供电,当灯泡电流为0.6A时,电势差是多少?闪灯线路的电阻是多少?
电势差为 8.4÷0.6=14 伏
电阻为 14÷0.6=23.33 欧

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