如图（甲）所示是某生产流水线上的产品输送及计数装置示意图．其中S为一激光源，R1为光敏电阻（有光照射
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\uff081\uff09\u4ea7\u54c1\u5bf9\u4f20\u9001\u5e26\u7684\u538b\u529b\uff1aF=G=mg=0.6kg\u00d710N/kg=6N\uff0c\u4ea7\u54c1\u5bf9\u4f20\u9001\u5e26\u7684\u538b\u5f3a\uff1ap=FS=6N(0.1m)2=600Pa\uff0c\u6545A\u4e0d\u6b63\u786e\uff1b\uff082\uff09\u4ea7\u54c1\u968f\u4f20\u9001\u5e26\u5300\u901f\u524d\u8fdb\u8fc7\u7a0b\u4e2d\uff0c\u4ea7\u54c1\u5904\u4e8e\u5e73\u8861\u72b6\u6001\uff0c\u7ad6\u76f4\u65b9\u5411\u7684\u91cd\u529b\u548c\u652f\u6301\u529b\u662f\u4e00\u5bf9\u5e73\u8861\u529b\uff0c\u800c\u6c34\u5e73\u4e0d\u53d7\u529b\uff0c\u5373\u6c34\u5e73\u65b9\u5411\u6ca1\u6709\u6469\u64e6\u529b\uff0c\u6545B\u4e0d\u6b63\u786e\uff1b\uff083\uff09\u7531\u56fe\u8c61\u53ef\u77e5\uff1a\u6bcf\u7ecf\u8fc70.6s\uff0c\u5c31\u6709\u4e00\u4e2a\u4ea7\u54c1\u901a\u8fc7\u8ba1\u6570\u88c5\u7f6e\uff0c\u5219\u6bcf1h\u901a\u8fc7S\u4e0eRl\u4e4b\u95f4\u7684\u4ea7\u54c1\u4e2a\u6570\uff1an=3600s0.6s/\u4e2a=6000\u4e2a\uff0c\u6545C\u6b63\u786e\uff1b\uff084\uff09\u7531\u7532\u56fe\u53ef\u77e5\uff1aR1\u3001R2\u4e32\u8054\uff0c\u7531\u5149\u654f\u7535\u963b\u6709\u5149\u7167\u5c04\u65f6\u963b\u503c\u8f83\u5c0f\u53ef\u77e5\uff0c\u5f53\u6709\u5149\u7167\u5c04\u65f6\uff0cR1\u7684\u963b\u503c\u53d8\u5c0f\uff0c\u7535\u8def\u7684\u603b\u7535\u963b\u53d8\u5c0f\uff0c\u2235I=UR\uff0c\u2234\u7535\u8def\u4e2d\u7684\u7535\u6d41\u53d8\u5927\uff0cR2\u4e24\u7aef\u7684\u7535\u538b\u53d8\u5927\uff1b\u2235\u4e32\u8054\u7535\u8def\u603b\u7535\u538b\u7b49\u4e8e\u5404\u5206\u7535\u538b\u4e4b\u548c\uff0c\u2234R1\u4e24\u7aef\u7684\u7535\u538b\u53d8\u5c0f\uff0c\u5373R1\u4e24\u7aef\u7684\u7535\u538b\u8f83\u4f4e\uff0c\u7531\u56fe\u8c61\u77e5R1\u7684\u7535\u538bU1=2V\uff0c\u5219U2=U-U1=6V-2V=4V\uff1bR1\u65e0\u6fc0\u5149\u7167\u65f6\uff0c\u7531\u56fe\u8c61\u53ef\u5f97U1\u2032=4V\uff0cU2\u2032=U-U1\u2032=6V-4V=2V\uff0c\u6240\u4ee5\uff0c\u6709\u5149\u7167\u5c04\u548c\u65e0\u5149\u7167\u5c04\u65f6\u4fdd\u62a4\u7535\u963bR2\u4e24\u7aef\u7684\u7535\u538b\u4e4b\u6bd4U2\uff1aU2\u2032=4V\uff1a2V=2\uff1a1\uff0c\u6545D\u4e0d\u6b63\u786e\uff0e\u6545\u9009C\uff0e
（1）由图知，R1与R2串联，无光照时R1的电压为4V，有光照时R1的电压为2V：
无照时，电路中的电流：
I1=I2=
| U?U1 |
| R2 |
| 6V?4V |
| 40Ω |
R1=
| U1 |
| I1 |
| 4V |
| 0.05A |
有光照时，电路中的电流：
I1'=I2'=
| U?U′1 |
| R2 |
| 6V?2V |
| 40Ω |
R1'=
| U′1 |
| I′1 |
| 2V |
| 0.1A |
（2）由图象知，
1h内无光照的时间为：
t1=（0.6s-0.4s）×
| 3600s |
| 0.6s |
1h内有光照的时间为：
t2=3600s-1200s=2400s，
光敏电阻1h消耗的电能：
W=W1+W2=U1I1t1+U2I2t2=4V×0.05A×1200s+2V×0.1A×2400s=240J+480J=720J．
答：光敏电阻在两种状态下的阻值分别为80Ω、20Ω，光敏电阻1h消耗的电能为720J．
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