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            2019年福建成人高考物理復習要點:閉合電路歐姆定律

            福建成人高考信息網www.laiwobuy.com 發布時間: 2019年07月29日

                物理、化學綜合考試是報考理工科本科院校考生的必考科目。從成人高考物理大綱來看,成人高考將更注重考查考生物理的基礎知識和基本技能,考查知識的同時注重考查能力。建議考生掌握2019年福建成人高考物理復習要點,這樣才能在考試中取得不錯的成績。


            2019年福建成人高考物理復習要點


                  2019年福建成人高考物理復習要點:閉合電路歐姆定律


              (1)內容:閉合電路的電流強度跟電源的電動勢成正比,跟閉合電路總電阻成反比.


              (2)表達式:I=E/(R+r)


              (3)總電流I和路端電壓U隨外電阻R的變化規律


              當R增大時,I變小,又據U=E-Ir知,U變大.當R增大到∞時,I=0,U=E(斷路).


              當R減小時,I變大,又據U=E-Ir知,U變小.當R減小到零時,I=E r ,U=0(短路).


              9.路端電壓隨電流變化關系圖像


              U端= E-Ir.上式的函數圖像是一條向下傾斜的直線.縱坐標軸上的截距等于電動勢的大小;橫坐標軸上的截距等于短路電流I短;圖線的斜率值等于電源內阻的大小.


              10.閉合電路中的三個功率


              (1)電源的總功率:就是電源提供的總功率,即電源將其他形式的能轉化為電能的功率,也叫電源消耗的功率P總=EI.


              (2)電源輸出功率:整個外電路上消耗的電功率.對于純電阻電路,電源的輸出功率.


              P出 =I2R=[E/(R+r)]2R ,當R=r時,電源輸出功率最大,其最大輸出功率為Pmax=E2/4r


              (3)電源內耗功率:內電路上消耗的電功率 P內 = U內I = I2r


              (4)電源的效率:指電源的輸出功率與電源的功率之比,即η=P出/P總 = IU/IE = U/E .


              11.電阻的測量


              原理是歐姆定律.因此只要用電壓表測出電阻兩端的電壓,用安培表測出通過電流,用R=U/I 即可得到阻值.


              ①內、外接的判斷方法:若Rx大于RA ,采用內接法;Rx 小于RV ,采用外接法.


              ②滑動變阻器的兩種接法:分壓法的優勢是電壓變化范圍大;限流接法的優勢在于電路連接簡便,附加功率損耗小.當兩種接法均能滿足實驗要求時,一般選限流接法.當負載RL較小、變阻器總阻值較大時(RL的幾倍),一般用限流接法.


              但以下三種情況必須采用分壓式接法:


              a.要使某部分電路的電壓或電流從零開始連接調節,只有分壓電路才能滿足.


              b.如果實驗所提供的電壓表、電流表量程或電阻元件允許最大電流較小,采用限流接法時,無論怎樣調節,電路中實際電流(壓)都會超過電表量程或電阻元件允許的最大電流(壓),為了保護電表或電阻元件免受損壞,必須要采用分壓接法電路.


              c.伏安法測電阻實驗中,若所用的變阻器阻值遠小于待測電阻阻值,采用限流接法時,即使變阻器觸頭從一端滑至另一端,待測電阻上的電流(壓)變化也很小,這不利于多次測量求平均值或用圖像法處理數據.為了在變阻器阻值遠小于待測電阻阻值的情況下能大范圍地調節待測電阻上的電流(壓),應選擇變阻器的分壓接法.


                   現在正值2019年福建成人高考的復習備考階段,各位考生可以向我們的專業老師咨詢報名條件、考試科目、考試時間、錄取方法等相關信息,考生可從即日起在福建成人高考網信息進行網絡預報名,專人負責跟蹤學習,幫您順利拿到本科證書。


            福建省成人高考預報名入口(點擊報名)


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