电路如图所示，电池内阻为r，定值电阻R1=r，可变电阻R2的全部电阻值R2=2r，当变阻器的滑片由a滑到b的过程
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A、对于电源，当电源的内外电阻相等时，电源的输出功率最大；在滑动变阻器的滑臂P由a滑到b的过程中，变阻器接入电路的电阻变小．因外电路电阻始终大于电源内电阻，故电源的输出功率不断增大，故A正确；B、电源的效率为 η=
| UI |
| EI |
| R1+R2 |
| R1+R2+r |
C、在滑动变阻器的滑臂P由a滑到b的过程中，变阻器接入电路的电阻变小，电路中电流增大，定值电阻R1的功率不断增大，故C正确．
D、将电源和电阻R1当作一个等效电源，在滑动变阻器的滑片由a滑到b的过程中，R2＜R1+r，等效电源的内电阻大于等效外电阻，等效外电阻减小的过程中，可变电阻R2的功率不断减小．故D正确；
故选：ABCD．
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