Question

19£®Ð¡ºìµÄÂèÂ蹺ÂòÁËһ̨¼ÒÓö¹½¬»ú£¬Æ䲿·Ö¼¼Êõ²ÎÊýÈçÏÂ±í£®ËµÃ÷ÊéÖнéÉÜÁËÖÆ×÷¶¹½¬µÄ¹ý³Ì£º°´ºÏÊʵıÈÀý°Ñ¶¹ÁÏ¡¢ÇåË®·ÅÈ˶¹½¬»úÖУ¬¾­¹ýÔ¤ÈÈ¡¢´ò½¬¡¢¼ÓÈȵȳÌÐò£¬¼´¿ÉÖƳÉÊ춹½¬£¬ÆäÖдò½¬ºÍ¼ÓÈÈÊǽ»Ìæ½øÐеģ®

ÓõçÆ÷	¶î¶¨µçѹ/V	¶î¶¨¹¦ÂÊ/W
µç¶¯»ú	220	200
¼ÓÈÈÆ÷	220	1210

£¨1£©ÎªÁË°²È«£¬¸Ã¶¹½¬»úµÄµçÔ´Ïß²åͷӦѡÓÃͼÖÐÄÄÒ»¸ö£¿
£¨2£©´ò½¬Ê±£¬Ôڶµçѹϵ綯»ú¹¤×÷30s£¬µçÁ÷×öÁ˶àÉÙ¹¦£¿
£¨3£©ÔÚÓõç¸ß·åʱ¶Î£¬Êµ¼ÊµçѹֻÓÐ200V£¬¼ÓÈÈʱ¶¹½¬»úµÄʵ¼Ê¹¦ÂÊÊǶàÉÙ£¿£¨²»¿¼ÂÇζȶԵç×èµÄÓ°Ï죩

Answer 1

·ÖÎö £¨1£©ÓнðÊôÍâ¿ÇµÄÓõçÆ÷Íâ¿ÇÒª½ÓµØ£»
£¨2£©¸ù¾Ý¹«Ê½W=Pt¼ÆËãµç¹¦£»
£¨3£©¸ù¾Ý¹«Ê½P=$\frac{{U}^{2}}{R}$Çó³öµç×裬Ȼºó¸ù¾ÝP=$\frac{{U}^{2}}{R}$Çó³öʵ¼Ê¹¦ÂÊ£®

½â´ð ½â£º£¨1£©¶¹½¬»úÓнðÊôÍâ¿Ç£¬Íâ¿ÇÒª½ÓµØ£¬¹ÊÑ¡¼×£»
£¨2£©´ò½¬Ê±£¬Ôڶµçѹϵ綯»ú¹¤×÷30s£¬µçÁ÷×öµÄ¹¦Îª£ºW=Pt=200W¡Á10s=2000J£»
£¨3£©Óɹ«Ê½P=$\frac{{U}^{2}}{R}$µÄ¶¹½¬»ú¼ÓÈÈʱµÄµç×èΪ£ºR=$\frac{{U}^{2}}{P'}$=$\frac{{£¨220V£©}^{2}}{1210W}$=40¦¸£»
¼ÓÈÈʱ¶¹½¬»úµÄʵ¼Ê¹¦ÂÊÊÇP_ʵ=$\frac{{{U}_{ʵ}}^{2}}{R}$=$\frac{{£¨200V£©}^{2}}{40¦¸}$=1000W£®
´ð£º£¨1£©ÎªÁË°²È«£¬¸Ã¶¹½¬»úµÄµçÔ´Ïß²åͷӦѡÓÃͼ¼×£»£¨2£©´ò½¬Ê±£¬Ôڶµçѹϵ綯»ú¹¤×÷30s£¬µçÁ÷×öÁË2000JµÄ¹¦£»£¨3£©ÔÚÓõç¸ß·åʱ¶Î£¬Êµ¼ÊµçѹֻÓÐ200V£¬¼ÓÈÈʱ¶¹½¬»úµÄʵ¼Ê¹¦ÂÊÊÇ1000W£®

µãÆÀ ¶ÔÓÚµçѧÎÊÌ⣬²»¿¼Âǵç×è±ä»¯Ê±£¬Ò»°ãÀûÓöµçѹºÍ¶î¶¨¹¦ÂÊ£¬¸ù¾ÝR=$\frac{{U}^{2}}{P}$Çó³öµç×èÊǺܳ£ÓõÄÒ»ÖÖ·½·¨£®