转è¿200转æ¶èççµè½W=200/1800=1/9kW*h =1/9*3600000=400000J
çæ°´å¨çå®é åçP=w/t=400000/400=4000W
çæ°´å¨ççµé»R=Ué¢2/Pé¢=220æ¹/1210=40Ω
P=Iæ¹Rå¾Iæ¹=P/R=4000/40=100 I=10A
3. çæ°´å¨çå®é çµåU=IR=40*10=400Vï¼è¿ä¸ªç»æä¸å·²ç¥æ¡ä»¶çç¾äºï¼å®é çµå大äºé¢å®çµåãè¿æ¯ä¸å¯è½çãè¿æ ·çè¯ï¼çæ°´å¨ä¼ç§æ¯çãå¯è½å·²ç¥æ¡ä»¶ä¸åªä¸ªæ°åæéäºã
æ¥ çç®çè¯ï¼æè·¯æ¯è¿æ ·çï¼çµç«è¾åºççµå220=导线æ¶èççµå+çæ°´å¨çå®é çµåã
设å°æ家å°çµç«çè·ç¦»ä¸ºx,导线ççµé»R线=2*5x,导线æ¶èççµåU=IRä»£å ¥å°±å¯ä»¥æ±ç»æäº
追é®3600000æ¯ä»ä¹é
ä»ç¬¬ä¸é®é½å¼å§éäºã