要测定一个额定电压为3.8v的小灯泡正常发光时的电阻，所提供的器材有6v的恒压电源，电流表，电压表（0-15v 一个小灯泡正常发光时两端所加电压为3.8V，为了测其正常发光...
\u8981\u6d4b\u5b9a\u4e00\u4e2a\u989d\u5b9a\u7535\u538b\u4e3a3.8v\u7684\u5c0f\u706f\u6ce1\u6b63\u5e38\u53d1\u5149\u65f6\u7684\u7535\u963b\uff0c\u6240\u63d0\u4f9b\u7684\u6750\u6599\u67096v\u7684\u6052\u538b\u7535\u6e90\u5c06\u706f\u6ce1\u548c\u6ed1\u52a8\u53d8\u963b\u5668\u4e32\u8054\uff0c\u7528\u7535\u538b\u8868\u6d4b\u706f\u6ce1\u4e24\u7aef\u7535\u538b\uff0c\u7528\u7535\u6d41\u8868\u6d4b\u5b83\u7684\u7535\u6d41\uff0c\u8c03\u8282\u6ed1\u52a8\u53d8\u963b\u5668\uff0c\u8ba9\u7535\u538b\u8868\u793a\u6570\u7b49\u4e8e3.8V\uff0c\u75283.8V\u7684\u7535\u538b\u9664\u4ee5\u6b64\u65f6\u7684\u7535\u6d41\u5c31\u6c42\u5f97\u7535\u963b
\u4f7f\u706f\u6ce1\u4e0e\u6ed1\u52a8\u53d8\u963b\u5668\u4e32\u8054\uff0c\u7535\u6d41\u8868\u6d4b\u91cf\u7535\u8def\u4e2d\u7684\u7535\u6d41\uff0c\u7535\u538b\u8868\u5e76\u8054\u5728\u6ed1\u52a8\u53d8\u963b\u5668\u4e24\u7aef\uff1b\u8fde\u63a5\u5b8c\u7535\u8def\u65f6\uff0c\u79fb\u52a8\u6ed1\u52a8\u53d8\u963b\u5668\u7684\u6ed1\u7247\uff0c\u4f7f\u7535\u538b\u8868\u7684\u793a\u6570\u4e3a2.2V\uff0c\u8bfb\u51fa\u6b64\u65f6\u7535\u6d41\u8868\u7684\u793a\u6570\uff0c\u7136\u540e\u6839\u636eR=UI\u6c42\u51fa\u706f\u6ce1\u6b63\u5e38\u53d1\u5149\u7684\u7535\u963b\uff0e\u4ece\u7535\u6e90\u6b63\u6781\u4f9d\u6b21\u4e32\u8054\u5f00\u5173\u3001\u6ed1\u52a8\u53d8\u963b\u5668\u3001\u706f\u6ce1\u3001\u7535\u6d41\u8868\u56de\u5230\u7535\u6e90\u8d1f\u6781\uff0c\u7535\u538b\u8868\u5e76\u8054\u5728\u6ed1\u52a8\u53d8\u963b\u5668\u4e24\u7aef\uff0e\u5982\u4e0b\u56fe\u6240\u793a\uff1a\u6545\u7b54\u6848\u4e3a\uff1a\u4f7f\u706f\u6ce1\u4e0e\u6ed1\u52a8\u53d8\u963b\u5668\u4e32\u8054\uff0c\u7535\u6d41\u8868\u6d4b\u91cf\u7535\u8def\u4e2d\u7684\u7535\u6d41\uff0c\u7535\u538b\u8868\u5e76\u8054\u5728\u6ed1\u52a8\u53d8\u963b\u5668\u4e24\u7aef\uff1b\u8fde\u63a5\u5b8c\u7535\u8def\u65f6\uff0c\u79fb\u52a8\u6ed1\u52a8\u53d8\u963b\u5668\u7684\u6ed1\u7247\uff0c\u4f7f\u7535\u538b\u8868\u7684\u793a\u6570\u4e3a2.2V\uff0c\u8bfb\u51fa\u6b64\u65f6\u7535\u6d41\u8868\u7684\u793a\u6570\uff0c\u7136\u540e\u6839\u636eR=UI\u6c42\u51fa\u706f\u6ce1\u6b63\u5e38\u53d1\u5149\u7684\u7535\u963b\uff0e
把电压表并联在滑动变阻器两端，移动滑片是电压表的示数为2.2V，则灯泡两端电压就是3.8V了，读出此时电流表示数为I就可以测出电阻R。再移动滑片多测几组数据。
把电阻改成灯泡就行
1L的说法有问题啊！电源还有内阻啊。
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绛旓細瀹為獙鐢佃矾鍥 鐢靛帇琛ㄧ殑閲忕▼鍙湁0~3V.鏁呬笉鑳界洿鎺娴嬮瀹氱數鍘嬩负3.8V鐨灏忕伅娉.鍙祴涓茶仈鐨勭數闃讳袱绔數鍘. 瀹為獙寮濮嬪悗. 褰撹皟鑺備覆鑱旂殑鍙彉鐢甸樆鐨勪袱绔數鍘嬩负 6锛3.8=2.2浼忔椂.鐏场鐢靛帇灏辨槸3.8浼.鍚屾椂娴嬪嚭鐢垫祦A. 灏忕伅娉＄殑棰濆畾鍔熺巼P=U*鈪(鐢靛帇X鐢垫祦)...
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