将光敏电阻R和定值电阻R0、电流表、电压表连成电路，接在9V的电源上，如图，光敏电阻阻值随光强变化关系 将光敏电阻R和定值电阻R0、电流表、电压表连成如图所示电路，...
\uff082014?\u4e1c\u6d77\u53bf\u6a21\u62df\uff09\u5c06\u5149\u654f\u7535\u963bR\u548c\u5b9a\u503c\u7535\u963bR0\u3001\u7535\u6d41\u8868\u3001\u7535\u538b\u8868\u8fde\u6210\u7535\u8def\u5982\u56fe\uff0c\u63a5\u57289V\u7684\u7535\u6e90\u4e0a\uff0c\u5149\u654f\u7535\u963b\u963b\u82e5\u7535\u6d41\u8868\u7684\u793a\u6570\u589e\u5927\uff0c\u6839\u636e\u516c\u5f0fI=UR\u53ef\u77e5\u7535\u8def\u7535\u963b\u53d8\u5c0f\uff0c\u4ece\u8868\u4e2d\u53ef\u77e5\u5149\u5f3a\u53d8\u5927\uff0c\u6b64\u65f6\u5b9a\u503c\u7535\u963b\u4e24\u7aef\u7684\u7535\u538b\u53d8\u5927\uff0c\u6839\u636e\u4e32\u8054\u7535\u538b\u7684\u89c4\u5f8b\u53ef\u77e5\uff0c\u5149\u654f\u7535\u963b\u4e24\u7aef\u7684\u7535\u538b\u53d8\u5c0f\uff0c\u4e5f\u5c31\u662f\u7535\u538b\u8868\u793a\u6570\u53d8\u5c0f\uff0e\u5149\u5f3a\u4e0e\u5149\u654f\u7535\u963b\u7684\u4e58\u79ef\u4fdd\u6301\u4e0d\u53d8\uff0c1cd\u00d718\u03a9=1.5cd\u00d7R\uff0c\u6240\u4ee5R=12\u03a9\uff0e\u5149\u654f\u7535\u963b\u4e24\u7aef\u7684\u7535\u538bU1=IR=0.5A\u00d712\u03a9=6V\uff0c\u6240\u4ee5\u5b9a\u503c\u7535\u963b\u4e24\u7aef\u7684\u7535\u538bUR=U-U1=9V-6V=3V\uff0c\u901a\u75351\u5206\u949fR0\u4e0a\u4ea7\u751f\u7684\u70ed\u91cf\u4e3aQ=URIt=3V\u00d70.5A\u00d760s=90J\uff0e\u6545\u7b54\u6848\u4e3a\uff1a\u589e\u5927\uff1b\u51cf\u5c0f\uff1b12\uff1b90\uff0e
\uff081\uff09\u5f53\u7535\u6d41\u8868\u793a\u6570\u589e\u5927\u65f6\uff0c\u2235I=UR\uff0c\u2234\u7531R=UI\u53ef\u77e5\uff0c\u7535\u8def\u4e2d\u7684\u603b\u7535\u963b\u51cf\u5c0f\uff0c\u5373\u5149\u654f\u7535\u963b\u7684\u963b\u503c\u53d8\u5c0f\uff0c\u7531\u8868\u683c\u4e2d\u6570\u636e\u53ef\u77e5\u5149\u5f3a\u5728\u589e\u5927\uff0c\u6839\u636e\u4e32\u8054\u7535\u8def\u7535\u963b\u7684\u5206\u538b\u7279\u70b9\u53ef\u77e5\u5149\u654f\u7535\u963b\u4e24\u7aef\u5206\u5f97\u7684\u7535\u538b\u5668\u51cf\u5c0f\uff0c\u5373\u7535\u538b\u8868\u7684\u793a\u6570\u51cf\u5c0f\uff1b\uff082\uff09\u7531\u8868\u4e2d\u6570\u636e\u53ef\u77e5\uff0c\u5149\u5f3a\u4e0e\u5149\u654f\u7535\u963b\u7684\u4e58\u79ef\u4fdd\u6301\u4e0d\u53d8\uff0c\u6240\u4ee5\u5149\u654f\u7535\u963b\u968f\u5149\u5f3a\u7684\u53d8\u5316\u662f\u4e00\u4e2a\u53cd\u6bd4\u4f8b\u51fd\u6570\uff1b\u22351cd\u00d718\u03a9=1.8cd\u00d7R\uff0c\u2234R=10\u03a9\uff0c\u7535\u8def\u4e2d\u7684\u603b\u7535\u963b\uff1aR\u603b=UI=9V0.5A=18\u03a9\uff0c\u2235\u4e32\u8054\u7535\u8def\u4e2d\u603b\u7535\u963b\u7b49\u4e8e\u5404\u5206\u7535\u963b\u4e4b\u548c\uff0c\u2234\u5b9a\u503c\u7535\u963b\u7684\u963b\u503c\uff1aR0=R\u603b-R=18\u03a9-10\u03a9=8\u03a9\uff0c\u52191\u5206\u949fR0\u4e0a\u4ea7\u751f\u7684\u70ed\u91cf\uff1aQ=I2R0t=\uff080.5A\uff092\u00d78\u03a9\u00d760s=120J\uff0e\u6545\u7b54\u6848\u4e3a\uff1a\u589e\u5927\uff1b\u51cf\u5c0f\uff1b10\uff1b120\uff0e
（1）当电流表示数增大时，∵I=
| U |
| R |
∴由R=
| U |
| I |
由表格中数据可知光强在增大，
根据串联电路电阻的分压特点可知光敏电阻两端分得的电压器减小，即电压表的示数减小；
（2）由表中数据可知，光强与光敏电阻的乘积保持不变，所以光敏电阻随光强的变化是一个反比例函数；
∵1cd×18Ω=1.5cd×R，
∴R=12Ω，
电路中的总电阻：
R总=
| U |
| I |
| 9V |
| 0.5A |
∵串联电路中总电阻等于各分电阻之和，
∴定值电阻的阻值：
R0=R总-R=18Ω-12Ω=6Ω．
故答案为：增大；减小；6．
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