冀教版八年级下册物理 求一套八年级下册（北师大版）数学，物理（冀教版） 期中测试卷...
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B\uff0c \u4e0a\u5347\u7684\u6c22\u6c14\u7403\u6ca1\u6709\u53d7\u5230\u91cd\u529b\u7684\u4f5c\u7528\uff1b
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2\uff0c\u67d0\u540c\u5b66\u7528250\u725b\u987f\u7684\u529b\u7ad6\u76f4\u5411\u4e0a\u63d0\u8d77\u4e00\u4e2a\u91cd200\u725b\u987f\u7684\u6c34\u6876\u65f6\uff0c\u6876\u53d7\u5230\u7684\u5408\u529b\u7684\u5927\u5c0f\u548c\u65b9\u5411\u662f\uff1a\uff08 \uff09
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3\uff0c\u5173\u4e8e\u60ef\u6027\u73b0\u8c61\uff0c\u4e0b\u5217\u8bf4\u6cd5\u4e2d\u9519\u8bef\u7684\u662f\uff1a\uff08 \uff09
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B\uff0c \u7528\u94c1\u94f2\u628a\u6c99\u9001\u4e0a\u8f66\u53a2\u65f6\uff0c\u94c1\u94f2\u4e0d\u52a8\u4e86\uff0c\u6c99\u4ecd\u4f1a\u5411\u524d\u8fd0\u52a8\uff1b
C\uff0c \u7ad9\u5728\u8f66\u4e0a\u7684\u4e58\u5ba2\uff0c\u5f53\u8f66\u7a81\u7136\u5f00\u52a8\u65f6\uff0c\u4f1a\u5411\u524d\u5012\uff1b
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4\uff0c\u4e0b\u9762\u54ea\u4e24\u4e2a\u529b\u662f\u5e73\u8861\u529b\uff1f\uff1a\uff08 \uff09
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B\uff0c \u6c7d\u8f66\u5728\u5e73\u76f4\u9053\u8def\u4e0a\u4f5c\u5300\u901f\u76f4\u7ebf\u8fd0\u52a8\u65f6\uff0c\u53d7\u5230\u7684\u7275\u5f15\u529b\u548c\u963b\u529b\uff1b
C\uff0c\u7528\u5f88\u5927\u7684\u529b\u6c14\u63a8\u7bb1\u5b50\uff0c\u7bb1\u5b50\u7ec8\u4e8e\u88ab\u63a8\u52a8\u4e86\uff0c\u4eba\u7684\u63a8\u529b\u548c\u7bb1\u5b50\u53d7\u5230\u7684\u6469\u64e6\u529b\uff1b
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5\uff0c\u4e0b\u9762\u54ea\u79cd\u505a\u6cd5\u662f\u4e3a\u4e86\u51cf\u5c0f\u6469\u64e6\uff1f\uff1a\uff08 \uff09
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C\uff0c \u963f\u57fa\u7c73\u5fb7\u53d1\u73b0\u4e86\u6d6e\u529b\u7684\u8ba1\u7b97\u65b9\u6cd5\uff1bD\uff0c \u6258\u91cc\u62c6\u5229\u5b9e\u9a8c\u6d4b\u51fa\u4e86\u5927\u6c14\u538b\u5f3a\u7684\u503c\u3002
7\uff0c\u4e00\u4e2a1\u725b\u987f\u7684\u94a9\u7801\uff0c\u6302\u5728\u5f39\u7c27\u79e4\u94a9\u4e0a\uff0c\u5f53\u94a9\u7801\u6d78\u6ca1\u5728\u6c34\u91cc\u65f6\uff0c\u5f39\u7c27\u79e4\u7684\u793a\u6570\u662f0.87\u725b\u987f\uff0c\u8fd9\u4e2a\u94a9\u7801\u53d7\u5230\u6c34\u7684\u6d6e\u529b\u662f\uff1a\uff08 \uff09
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8\uff0c\u5982\u56fe\u6240\u793a\uff0c\u5728\u88c5\u6709\u6c34\u7684\u5bb9\u5668\u91cc\uff0c\u6c34\u5bf9\u5bb9\u5668\u91cca\u3001b\u3001c\u4e09\u70b9\u7684\u538b\u5f3a\u5927\u5c0f\u662f\uff1a\uff08 \uff09
A\uff0c\u6c34\u5bf9a\u70b9\u6ca1\u6709\u538b\u5f3a\uff1b B\uff0c \u6c34\u5bf9c\u70b9\u6ca1\u6709\u538b\u5f3a\uff1b
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9\uff0c\u628a\u540c\u4e00\u4e2a\u5c0f\u7403\u653e\u5230\u4e09\u79cd\u5bc6\u5ea6\u4e0d\u540c\u7684\u6db2\u4f53\u91cc\uff0c\u5c0f\u7403\u9759\u6b62\u65f6\u7684\u60c5\u51b5\u5982\u56fe\u6240\u793a\uff0c\u90a3\u4e48\uff1a\uff08 \uff09
A\uff0c\u56fe\u7532\u6db2\u4f53\u7684\u5bc6\u5ea6\u6700\u5927\uff1bB\uff0c \u56fe\u4e59\u6db2\u4f53\u7684\u5bc6\u5ea6\u6700\u5927\uff1b
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10\uff0c\u5982\u56fe\uff0c\u7532\u3001\u4e59\u3001\u4e19\u3001\u4e01\u662f\u56db\u4e2a\u4f53\u79ef\u3001\u5f62\u72b6\u76f8\u540c\u800c\u6750\u6599\u4e0d\u540c\u7684\u7403\uff0c\u6839\u636e\u5b83\u4eec\u5728\u6c34\u4e2d\u9759\u6b62\u4e0d\u52a8\u65f6\u7684\u60c5\u51b5\u53ef\u4ee5\u5224\u5b9a\u53d7\u5230\u5bc6\u5ea6\u6700\u5c0f\u7684\u662f\uff1a\uff08 \uff09
A\uff0c\u7532\uff1b B\uff0c \u4e59\uff1b C\uff0c\u4e19\uff1b D\uff0c \u4e01\u3002
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C\uff0c\u8d39\u529b\u6760\u6746\u7684\u52a8\u529b\u81c2\u6bd4\u963b\u529b\u81c2\u957f\uff1bD\uff0c \u4ece\u652f\u70b9\u5230\u963b\u529b\u4f5c\u7528\u70b9\u7684\u8fde\u7ebf\u53eb\u963b\u529b\u81c2\u3002
12\uff0c\u5982\u56fe\u6240\u793a\uff0c\u5f39\u7c27\u79e4\u5bf9\u6760\u6746\u62c9\u529b\u7684\u529b\u81c2\u4e0e\u94a9\u7801\u5bf9\u6760\u6746\u62c9\u529b\u7684\u529b\u81c2\u4e4b\u6bd4\u662f5:2\uff0c\u5f39\u7c27\u79e4\u8bfb\u6570\u662f4\u725b\uff0c\u6760\u6746\u91cd\u5ffd\u7565\u4e0d\u8ba1\uff0c\u5219\u94a9\u7801\u91cd\uff1a\uff08 \uff09
A\uff0c 10\u725b\uff1bB\uff0c 4\u725b\uff1bC\uff0c 2.5\u725b\uff1bD\uff0c1.6\u725b\u3002
13\uff0c\u5206\u522b\u7528\u56fe\u4e2d\u6240\u793a\u7684\u88c5\u7f6e\u7532\u548c\u4e59\u628a\u540c\u4e00\u91cd\u7269\u540a\u5230\u540c\u4e00\u9ad8\u5ea6\u65f6\uff1a\uff08 \uff09
A\uff0c \u7528\u88c5\u7f6e\u7532\u540a\u8d77\u91cd\u7269\u6bd4\u7528\u88c5\u7f6e\u4e59\u7701\u529b\uff1b
B\uff0c \u7528\u88c5\u7f6e\u4e59\u540a\u8d77\u91cd\u7269\u6bd4\u7528\u88c5\u7f6e\u7532\u7701\u529b\uff1b
B\uff0c \u7528\u88c5\u7f6e\u7532\u6216\u88c5\u7f6e\u4e59\u540a\u8d77\u91cd\u7269\u6240\u7528\u62c9\u529b\u76f8\u540c\uff1b
D\uff0c \u7528\u88c5\u7f6e\u4e59\u540a\u8d77\u91cd\u7269\uff0c\u52a8\u529b\u79fb\u52a8\u7684\u8ddd\u79bb\u6bd4\u7528\u88c5\u7f6e\u7532\u5c0f\u3002
14\uff0c\u4e0b\u5217\u54ea\u79cd\u60c5\u51b5\u4e0d\u662f\u91cd\u529b\u505a\u529f\uff1f\uff1a\uff08 \uff09
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C\uff0c\u7ad6\u76f4\u5411\u4e0a\u629b\u540e\u7684\u77f3\u5757\u76f4\u5f80\u4e0b\u7838\uff1bD\uff0c \u653e\u8fdb\u6c34\u6c60\u91cc\u7684\u73bb\u7483\u7403\u6162\u6162\u4e0b\u6c89\u3002
15\uff0c\u5bf9\u4e8e\u4f7f\u7528\u6ed1\u8f6e\u7ec4\uff0c\u4e0b\u5217\u8bf4\u6cd5\u4e2d\u6b63\u786e\u7684\u662f\uff1a\uff08 \uff09
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C\uff0c\u53ef\u4ee5\u7701\u529b\uff0c\u540c\u65f6\u6709\u53ef\u7701\u8ddd\u79bb\uff1bD\uff0c \u53ef\u4ee5\u7701\u529b\uff0c\u540c\u65f6\u53ef\u4ee5\u6539\u53d8\u7528\u529b\u7684\u65b9\u5411\uff0c\u4f46\u4e0d\u80fd\u540c\u65f6\u7701\u8ddd\u79bb\u3002
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3.\u6b63\u786e\u7b54\u6848:D
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\u53ef\u80fd\u9519\u8bef\uff1a\u51fa\u73b0\u9519\u8bef\u7684\u4e3b\u8981\u539f\u56e0\u662f\u4e0d\u753b\u51fa\u4e24\u79cd\u60c5\u51b5\u4e0b\u7684\u7684\u7535\u8def\uff0e\u53ea\u662f\u5728\u7528\u8111\u5b50\u60f3\u7535\u8def\u56fe\uff0e\u4e71\u662f\u7b2c\u4e00\u611f\u53d7\uff0e\u611f\u5230\u65e0\u4ece\u4e0b\u624b\uff0e
\u6b63\u786e\u7b54\u6848:B
\u5206\u6790\u8fc7\u7a0b\uff1a
\u5f53\u7535\u8868\u4e3a\u7535\u538b\u8868\u65f6,S\u95ed\u5408,\u7535\u8def\u5982\u56fe1.\u7531\u4e8e\u7535\u538b\u8868\u76f8\u5f53\u4e8e\u65ad\u8def,\u53bb\u6389\u540e\u7535\u8def\u5982\u56fe2.\u7531\u56fe2\u53ef\u4ee5\u770b\u51fa\u4e24\u7535\u963b\u662f\u4e32\u8054.\u7531\u56fe1\u53ef\u77e5,\u7532\u7535\u538b\u8868\u6d4b\u7684\u662f\u603b\u7535\u538b,\u4e59\u7535\u538b\u8868\u6d4b\u7684\u662fR2\u7684\u7535\u538b.\u7531\u7535\u8def\u4e2d\u7535\u538b\u4e0e\u7535\u963b\u5173\u7cfb\u53ef\u77e5,\u4e24\u7535\u963b\u4e4b\u6bd4\u4e3aR1:R2=1:2.
\u5f53\u7535\u8868\u4e3a\u6d41\u8868\u65f6,S\u65ad\u5f00,\u7535\u8def\u5982\u56fe1.\u7531\u4e8e\u5f00\u5173\u65ad\u5f00,\u53bb\u6389\u540e\u7535\u8def\u5982\u56fe2.\u7531\u56fe2\u53ef\u4ee5\u770b\u51fa,\u4e24\u7535\u963b\u662f\u5e76\u8054,\u7535\u8868\u7532\u6d4b\u7684\u662fR2\u7684\u7535\u6d41,\u7535\u8868\u4e59\u6d4b\u7684\u662fR1\R2\u7684\u603b\u7535\u6d41.\u56e0\u4e3aR1:R2=1:2,\u6240\u4ee5I1:I2=2:1.\u5219\u4e59\u6d4b\u7684\u603b\u7535\u6d41\u4e0eR2\u7684\u7535\u6d41\u4e4b\u6bd4\u4e3a3:1.
5.0.5KW.h. 1680KW.h. \u4e0d\u8fde\u7eed\u5de5\u4f5c
\u521d\u4e09\u7269\u7406\u4e2d\u8003\u603b\u590d\u4e60\u7535\u5b66\u90e8\u5206\u6613\u9519\u9898\u5206\u6790
\u4f8b1.\u4e00\u4e2a\u9a8c\u7535\u5668\u5e26\u6709\u6b63\u7535\uff0c\u5b83\u7684\u7b94\u7247\u5f20\u5f00\u67d0\u4e00\u89d2\u5ea6\uff0c\u7528\u53e6\u4e00\u4e2a\u6709\u7edd\u7f18\u624b\u67c4\u7684\u5bfc\u4f53\u9760\u8fd1\u9a8c\u7535\u5668\u7684\u91d1\u5c5e\u7403\uff0c\u53d1\u73b0\u9a8c\u7535\u5668\u7684\u7b94\u7247\u7684\u5f20\u89d2\u51cf\u5c0f\uff0c\u5173\u4e8e\u5bfc\u4f53\u7684\u5e26\u7535\u60c5\u51b5\uff0c\u4e0b\u9762\u7684\u8bf4\u6cd5\u6b63\u786e\u7684\u662f\uff08 \uff09
A.\u53ea\u53ef\u80fd\u5e26\u8d1f\u7535 B.\u53ea\u53ef\u80fd\u5e26\u6b63\u7535
B.\u53ef\u80fd\u5e26\u8d1f\u7535\u6216\u4e0d\u5e26\u7535 D.\u53ef\u80fd\u5e26\u6b63\u7535\u6216\u4e0d\u5e26\u7535
[\u89e3\u6790]
\u9a8c\u7535\u5668\u7684\u7b94\u7247\u7684\u5f20\u89d2\u51cf\u5c0f\u8bf4\u660e\u7b94\u7247\u4e0a\u6b63\u7535\u8377\u51cf\u5c0f\uff0c\u800c\u91d1\u5c5e\u7403\u4e0a\u7684\u6b63\u7535\u8377\u589e\u52a0\uff0c\u663e\u7136\u8fd9\u662f\u5bfc\u4f53\u7684\u5f02\u79cd\u7535\u8377\u5438\u5f15\u7684\u7ed3\u679c\u3002\u8fd9\u8bf4\u660e\u5bfc\u4f53\u662f\u4e0d\u53ef\u80fd\u5e26\u6b63\u7535\u7684\uff0c\u5bfc\u4f53\u5e26\u8d1f\u7535\u662f\u53ef\u80fd\u7684\u3002\u4f46\u5982\u679c\u5bfc\u4f53\u4e0d\u5e26\u7535\uff0c\u9760\u8fd1\u5e26\u6b63\u7535\u7684\u91d1\u5c5e\u7403\u65f6\uff0c\u7531\u4e8e\u9759\u7535\u611f\u5e94\uff0c\u5bfc\u4f53\u7684\u8fd1\u7aef\u4f1a\u51fa\u73b0\u5f02\u79cd\u7535\u8377\u2500\u2500\u8d1f\u7535\u8377\uff0c\u8fdc\u7aef\u4f1a\u51fa\u73b0\u540c\u79cd\u7535\u8377\u2500\u2500\u6b63\u7535\u8377\uff0c\u8fd9\u79cd\u611f\u5e94\u7535\u8377\u4e5f\u4f1a\u5bf9\u91d1\u5c5e\u7403\u7684\u6b63\u7535\u8377\u6709\u5438\u5f15\u4f5c\u7528\uff0c\u4f7f\u7b94\u7247\u4e0a\u7684\u6b63\u7535\u8377\u51cf\u5c0f\uff0c\u6240\u4ee5\u5b8c\u6574\u7684\u7b54\u6848\u662f\uff1a\u5e26\u8d1f\u7535\u6216\u4e0d\u5e26\u7535\u90fd\u53ef\u80fd\u3002\u6b63\u786e\u7b54\u6848\u4e3aC\u3002
\u4f8b2.\u4e00\u4e2a\u706f\u6ce1\u7684\u94ed\u724c\u4e0a\u6807\u7740\u201cPZ220\u2500\u2500100\u201d\uff0c\u5728\u5ba4\u6e29\u4e0b\u7528\u4f0f\u5b89\u6cd5\u6d4b\u5f97\u5b83\u7684\u706f\u4e1d\u7535\u963b\u4e3aR1\uff0c\u540e\u5728\u6b63\u5e38\u5de5\u4f5c\u65f6\u518d\u7528\u4f0f\u5b89\u6cd5\u6d4b\u5f97\u5b83\u7684\u706f\u4e1d\u7535\u963b\u4e3aR2=48.4\u6b27\uff0c\u53d1\u73b0R2\u6bd4R1\u592710\u500d\u4ee5\u4e0a\uff0c\u8fd9\u662f\u7531\u4e8e\uff08 \uff09
A.\u524d\u4e00\u6b21\u6d4b\u5f97\u7684\u963b\u503c\u5fc5\u5b9a\u662f\u9519\u7684
B.\u540e\u4e00\u6b21\u6d4b\u5f97\u7684\u963b\u503c\u662f\u9519\u7684
C.\u5bf9\u5927\u591a\u6570\u5bfc\u4f53\u6765\u8bf4\uff0c\u6e29\u5ea6\u8d8a\u9ad8\uff0c\u7535\u963b\u8d8a\u5927\uff0c\u706f\u4e1d\u5c5e\u4e8e\u8fd9\u79cd\u5bfc\u4f53
D.\u4e0d\u8bba\u4ec0\u4e48\u5bfc\u4f53\uff0c\u90fd\u662f\u6e29\u5ea6\u8d8a\u9ad8\u7535\u963b\u8d8a\u5927
[\u89e3\u6790]
\u6b64\u9898\u662f\u5206\u6790\u5224\u65ad\u5b9e\u9a8c\u7ed3\u679c\u7684\u6b63\u8bef\uff0c\u4e3b\u8981\u662f\u8ba9\u5b66\u751f\u901a\u8fc7\u4e86\u89e3\u706f\u4e1d\u5728\u4e0d\u540c\u6761\u4ef6\uff08\u6e29\u5ea6\uff09\u4e0b\u7684\u7535\u963b\u503c\u4e0d\u540c\uff0c\u52a0\u6df1\u5b66\u751f\u5bf9\u5f71\u54cd\u5bfc\u4f53\u7535\u963b\u5927\u5c0f\u56e0\u7d20\u7684\u7406\u89e3\u3002\u5bfc\u4f53\u7535\u963b\u7684\u5927\u5c0f\u8ddf\u5bfc\u4f53\u7684\u957f\u5ea6\u3001\u622a\u9762\u79ef\u3001\u6750\u6599\u4ee5\u53ca\u6e29\u5ea6\u6709\u5173\uff0c\u5927\u90e8\u5206\u5bfc\u4f53\u7684\u7535\u963b\u503c\u968f\u6e29\u5ea6\u7684\u5347\u9ad8\u800c\u589e\u5927\uff08\u4e2a\u522b\u9664\u5916\uff09\u3002\u706f\u6ce1\u6b63\u5e38\u53d1\u5149\u65f6\u706f\u4e1d\u7684\u7535\u963b \u6b27\uff0c\u706f\u6ce1\u4e0d\u53d1\u5149\u65f6\u706f\u4e1d\u7535\u963b\u5f88\u5c0f\uff0c\u6240\u4ee5\u6b63\u786e\u7684\u8bf4\u6cd5\u662fC\u3002
\u4f8b3.\u628a\u4e00\u4e2a1.5\u6b27\u7684\u7535\u963b\u4e0e\u4e00\u4e2a\u7528\u7535\u5668\u4e32\u8054\u540e\u63a5\u5230\u7535\u538b\u662f7\u4f0f\u7684\u7535\u6e90\u4e0a\uff0c\u8981\u60f3\u4f7f\u7528\u7535\u5668\u6d88\u8017\u7684\u529f\u7387\u662f8\u74e6\uff0c\u5219\u8fd9\u4e2a\u7535\u6e90\u4f9b\u7ed9\u7528\u7535\u5668\u7684\u7535\u6d41\u53ef\u80fd\u662f\uff08 \uff09
A. 2\u5b89 B. 3.5\u5b89 C. 2.67\u5b89 D. 2.31\u5b89
[\u89e3\u6790]
\u672c\u9898\u5c06\u7528\u7535\u5668\u6d88\u8017\u529f\u7387P\u9650\u5b9a\u4e3a8\u74e6\uff0c\u5176\u6240\u52a0\u7535\u538bU\u3001\u901a\u8fc7\u7535\u6d41I\u548c\u81ea\u8eab\u7535\u963bR\u5747\u4e0d\u77e5\uff0c\u7528\u7535\u5668\u662f\u4e0e1.5\u6b27\u7684\u7535\u963b\u4e32\u8054\u57287\u4f0f\u7535\u6e90\u4e0a\u7684\uff0c\u901a\u8fc7\u7528\u7535\u5668\u7684\u7535\u6d41\u548c\u6574\u4e2a\u7535\u8def\u4e2d\u7684\u7535\u6d41\u76f8\u540c\uff0cI1=I2\uff0c\u5373 \uff0c\u89e3\u5f97\u7528\u7535\u5668\u7684\u7535\u963b\u5206\u522b\u4e3aR=2\u6b27\u548cR=1.125\u6b27\uff0c\u4ee3\u5165 \u53ef\u5f97\u7535\u6d41\u5f3a\u5ea6\u7684\u53ef\u80fd\u503c\u4e3aI=2\u5b89\u548cI=2.67\u5b89\u3002\u6b63\u786e\u9009\u9879\u4e3aA\u3001C\u3002
\u4f8b4.\u4e00\u76cf\u7535\u706f\u63a5\u5230220V\u7684\u7535\u6e90\u4e0a\u4f7f\u7528\u65f6\uff0c\u529f\u7387\u4e3a100W\uff0c\u5982\u679c\u5c06\u8fd9\u4e2a\u7535\u6e90\u8fde\u4e0a\u957f\u5bfc\u7ebf\uff0c
\u518d\u63a5\u8fd9\u76cf\u706f\u4f7f\u7528\uff0c\u5b83\u7684\u529f\u7387\u4e3a81W\uff0c\u6c42\u5bfc\u7ebf\u4e0a\u6d88\u8017\u7684\u7535\u529f\u7387\uff1f
[\u89e3\u6790]
\u706f\u5149\u7535\u538bU=220V\u65f6\u7684\u529f\u7387P=100W\uff0c\u529f\u7387\u4e3a \u65f6\u7684\u7535\u538b\u4e3aU\u2032\uff0c\u4e14\u706f\u6ce1\u7535\u963b\u4e0d\u53d8\u3002\u6839\u636eP=U2\uff0fR\uff0c\u5f97\uff1aP\uff0fP\u2032=U2\uff0fU1\uff0c\u6240\u4ee5
\u3002\u8fd9\u65f6\uff0c\u706f\u6ce1\u4e24\u7aef\u7684\u7535\u538bU\u706f=I\u706fR\u706f=484\u03a9\u00d79/22=198V\u3002\u8fd9\u65f6\uff0c\u52a0\u5728\u5bfc\u7ebf\u4e0a\u7684\u7535\u538b\u4e3a\uff1aU\u5bfc=U\uff0dU\u706f=220V\uff0d198V=22V\u3002\u5219\u5bfc\u7ebf\u4e0a\u6d88\u8017\u7684\u7535\u529f\u7387\u662fP\u5bfc\uff0fP\u2032=IU\u5bfc\uff0fIU\u2032\uff08\u706f\u6ce1\u3001\u5bfc\u7ebfI\u76f8\u540c\uff09\uff0cP\u5bfc=22V\u00d781W\uff0f198V=9W\u3002\u2234\u5bfc\u7ebf\u4e0a\u6d88\u8017\u7684\u529f\u7387\u4e3a9\u74e6\u3002
\u4f8b5.\u5c06\u706fL\u63a5\u5230\u7535\u538b\u4e3aU\u7684\u7535\u8def\u4e0a\u65f6\uff0c\u706f\u7684\u7535\u529f\u7387\u4e3a25\u74e6\uff0c\u82e5\u5c06\u706fL\u4e0e\u4e00\u4e2a\u7535\u963bR\u4e32\u8054\u540e\u4ecd\u63a5\u5728\u539f\u7535\u8def\u4e0a\u65f6\uff0c\u706fL\u6d88\u8017\u7684\u7535\u529f\u7387\u4e3a16\u74e6\uff0c\u8bbe\u706f\u4e1d\u7535\u963b\u4e0d\u53d8\uff0c\u5219\u6b64\u7535\u963b\u6d88\u8017\u7684\u7535\u529f\u7387\u662f\uff08 \uff09
A. 2\u74e6 B. 4\u74e6 C. 8\u74e6 D. 9\u74e6
[\u89e3\u6790]
\u6b64\u9898\u76ee\u4e3a\u4e24\u79cd\u7535\u8def\u72b6\u6001\uff0c\u5373\u706fL\u76f4\u63a5\u63a5\u5728\u7535\u6e90\u4e24\u7aef\uff0cPL=25W\uff0c\u6b64\u72b6\u6001\u53ef\u5217\u51fa\u65b9\u7a0bPL=U 2\uff0fRL=25W\uff0c\u5f53\u706fL\u4e0e\u7535\u963bR\u4e32\u8054\u540e\u63a5\u5230\u539f\u7535\u8def\u4e2d\uff0c\u706fL\u4e24\u7aef\u7535\u538b\u4e3aU2\uff0c\u6b64\u72b6\u6001\u53ef\u5217\u51fa\u65b9\u7a0b \uff0c\u5c06\u6b64\u4e8c\u65b9\u7a0b\u6c42\u6bd4\uff1a
\uff0c\u5219U\uff0fUL=5\uff0f4,UL\uff0fUR=4\uff0f1\uff0c\u6839\u636e\u5206\u538b\u516c\u5f0f\uff1aUL\uff0fUR=RL\uff0fR=4\uff0f1\uff0c\u5728\u4e32\u8054\u7535\u8def\u4e2d\uff0cPL\uff0fPR=RL\uff0fR=4\uff0f1\uff0c\u5219PR=4W\u3002\u6b63\u786e\u7b54\u6848\u4e3aB\u3002
\u4f8b6.\u5982\u56fe1\u6240\u793a\u7684\u7535\u8def\uff0c\u7535\u6e90\u7535\u538b\u4fdd\u6301\u4e0d\u53d8\uff0c\u5f53\u5f00\u5173S\u95ed\u5408\u65f6\uff0c\u7535\u6d41\u8868\u7684\u793a\u6570\u662f0.5
\u5b89\u3002\u5f00\u5173\u65ad\u5f00\u540e\uff0c\u7535\u538b\u8868\u7684\u793a\u6570\u662f4\u4f0f\uff0c\u7535\u963bR2\u7684\u529f\u7387\u662f0.2\u74e6\u3002\u5219\u6b64\u65f6\u7535\u6d41\u7684\u793a\u6570\u662f
\u5b89\u3002
[\u89e3\u6790]
\u6b64\u9898\u76ee\u4e3a\u4e24\u79cd\u7535\u8def\u72b6\u6001\uff0c\u5176\u4e00\u662f\u5f53\u5f00\u5173S\u95ed\u5408\u65f6\uff0cR2\u88ab\u5c40\u90e8\u77ed\u8def\uff0cR1\u2032\u76f4\u63a5\u63a5\u7535\u6e90\u4e24\u7aef\uff0c\u7535\u8def\u4e2d\u7684\u7535\u6d41\u4e3a0.5\u5b89\u3002\u7531\u6b64\u72b6\u6001\u53ef\u5230\u65b9\u7a0bI1=U\uff0fR1=0.5A\u3002\u5f53\u5f00\u5173S\u65ad\u5f00\u540e\uff0cR1\u548cR2\u4e32\u8054\u4e3a\u7b2c\u4e8c\u79cd\u7535\u8def\u72b6\u6001\uff0c\u6b64\u65f6\u4f0f\u7279\u8868\u6d4b\u5f97R1\u4e24\u7aef\u7535\u538bU1=4V\u3002\u7535\u963bR2\u7684\u529f\u7387P2\u4e3a1.2\u74e6\u3002\u7531\u7b2c\u4e8c\u79cd\u72b6\u6001\u4e2d\u7535\u6d41\u76f8\u7b49\uff0c\u53ef\u5217\u5f97\u65b9\u7a0b\uff1aI2=U1\uff0fR1\u548cI2=P2\uff0f(U\uff0dU1)\uff0c\u53734V\uff0fR1=1.2W\uff0f(U\uff0d4V)\u3002\u7531\u7b2c\u4e00\u3001\u7b2c\u4e8c\u72b6\u6001\u6240\u5217\u65b9\u7a0b\u8054\u7acb\u53ef\u89e3\u5f97R1=20\u03a9\u3002\u4ee3\u5165I2=U1\uff0fR1=4V\uff0f20\u03a9=0.2A\u3002\u6b63\u786e\u7b54\u6848\u4e3a\u201c0.2\u201d\u3002
\u4f8b7.\u5c06\u4e00\u76cf\u706f\u63a5\u5728\u7535\u6e90\u7535\u538b\u4e0d\u53d8\u7684\u7535\u8def\u4e2d\u4f7f\u7528\u65f6\uff0c\u5b83\u7684\u7535\u529f\u7387\u662f40\u74e6\u3002\u5982\u679c\u5c06\u706fL\u8ddf\u7535\u963bR\u4e32\u8054\u540e\u63a5\u5230\u540c\u4e00\u7535\u6e90\u4e0a\uff0c\u7535\u963bR10\u79d2\u5185\u7535\u6d41\u505a\u4e8636\u7126\u8033\u7684\u529f\uff0c\u6b64\u65f6\u706f\u7684\u529f\u7387\u662f \u74e6\u3002\uff08RL\uff1eR\uff09
[\u89e3\u6790]
\u6b64\u9898\u76ee\u7684\u7535\u8def\u72b6\u6001\u4e3a\u4e24\u4e2a\u3002\u5176\u4e00\u662f\u706fL\u76f4\u63a5\u63a5\u5230\u7535\u6e90\u4e24\u7aef\uff0c\u5219\u706f\u7684\u529f\u7387\u4e3a40W\u3002\u7531\u6b64\u72b6\u6001\u53ef\u5217\u51fa\u65b9\u7a0bPL=U 2\uff0fRL=40W\u3002\u5176\u4e8c\u662f\u706fL\u548cR\u4e32\u8054\u540e\u518d\u63a5\u5165\u539f\u7535\u8def\uff0c\u7535\u963bR\u7684\u529f\u7387\u4e3aPR=WR\uff0ft=36J\uff0f10S=3.6W\uff0c\u5219PR=I2R=(U\uff0f(R\uff0bRL))2•R=3.6W\uff0c\u7531\u4e24\u79cd\u72b6\u6001\u6240\u5217\u65b9\u7a0b\u6c42\u6bd4PL\uff0fPR=(R\uff0bRL)2\uff0fR•RL=40W\uff0f3.6W\uff0c\u53ef\u6c42\u5f97RL\uff0fR=9\uff0f1\u548cRL\uff0fR=1\uff0f9\uff08\u636e\u9898\u610f\u820d\uff09\u3002\u5728\u4e32\u8054\u7535\u8def\u4e2dPL\u2032\uff0fPR=RL\uff0fR=9\uff0f1\uff0c\u2234PL\u2032=9PR=9\u00d73.6W=32.4W\u3002\u6b63\u786e\u7b54\u6848\u4e3a\u201c32.4\u201d\u3002
\u4f8b8.\u7532\u3001\u4e59\u706f\u6ce1\u4e32\u8054\u63a5\u5165\u7535\u538b\u4e00\u5b9a\u7684\u7535\u8def\u4e2d\uff0c\u7532\u706f\u7684\u529f\u7387\u4e3aP\u7532\uff0c\u4e59\u706f\u7684\u529f\u7387\u4e3aP\u4e59\uff1b\u82e5\u628a\u7532\u706f\u548c\u4e59\u706f\u5e76\u8054\u63a5\u5165\u540c\u4e00\u7535\u8def\u4e2d\uff0c\u5219\u7532\u706f\u7684\u529f\u7387\u4e3a \u3002
[\u89e3\u6790]
\u5f53\u4e24\u706f\u4e32\u8054\u63a5\u5165\u7535\u538b\u4e00\u5b9a\u7684\u7535\u8def\u4e2d\uff0c\u7532\u3001\u4e59\u4e24\u706f\u7684\u529f\u7387\u5206\u522b\u4e3aP\u7532\u3001P\u4e59\uff0cP\u7532=U2/R\u7532\uff0c \uff1b\u7532\u3001\u4e59\u4e24\u706f\u5e76\u8054\u5728\u7535\u8def\u4e2d\uff0cP\u7532\u2032=U2\uff0fR\u7532\u3002\u6240\u4ee5
P\u7532\u2032\uff0fP\u7532=U2\uff0fR\u7532\u00f7U\u75322\uff0fR\u7532=(U\uff0fU\u7532)2= \uff0c
\u2234 \u3002
\u4f8b9.\u628a\u989d\u5b9a\u7535\u538b\u662f4.8\u4f0f\u7684\u5c0f\u706f\u6ce1\u548c\u5b9a\u503c\u7535\u963bR\u5e76\u8054\u5728\u67d0\u4e00\u7535
\u8def\u4e2d\uff0c\u706f\u6ce1\u6b63\u5e38\u53d1\u5149\uff0c\u5e72\u8def\u4e2d\u7684\u7535\u6d41\u662f1.2\u5b89\u3002\u82e5\u628a\u5b83\u4eec\u4e32\u8054\u5728\u53e6\u4e00\u7535\u8def\u4e2d\uff0c\u5c0f\u706f\u6ce1\u7684\u5b9e\u9645\u529f\u7387\u662f\u5b83\u989d\u5b9a\u529f\u7387\u7684
1\uff0f4\uff0c\u8fd9\u65f6\u5b9a\u503c\u7535\u963bR\u6d88\u8017\u7684\u7535\u529f\u7387\u662f0.24\u74e6\u3002\u5219\u5c0f\u706f\u6ce1\u7684\u989d\u5b9a\u529f\u7387\u662f\u591a\u5c11\u74e6\uff1f
[\u89e3\u6790]
\u6839\u636eP=I2R
\uff0c\u2234
\u7531\u5e76\u8054\u7535\u8def \u2460
\u7531\u4e32\u8054\u7535\u8def\u7535\u6d41\u76f8\u7b49 \u2461
\u8054\u7acb\u2460\u2461\u53ef\u89e3\u5f97\uff1aI=0.4A\uff0cPL=U•I1=1.92W.
\u4f8b10.\u5982\u56fe3\u6240\u793a\uff0cR1=10\u6b27\uff0cR2\u7684\u6700\u5927\u7535\u963b\u503c\u4e3a30\u6b27\uff0c\u7535\u6e90\u7535\u538b\u503c\u4e3a8\u4f0f\uff0c\u6c42\u53d8\u963b\u5668R2\u8fde\u5165\u7535\u8def\u7684\u7535\u963b\u4e3a\u591a\u5927\u65f6\uff0cR2\u4e0a\u6d88\u8017\u7684\u7535\u529f\u7387\u6700\u5927\uff1f\u6700\u5927\u4e3a\u591a\u5c11\uff1f
[\u89e3\u6790]
\u8bbeR2\u8fde\u5165\u7535\u8def\u4e2d\u7684\u7535\u963b\u4e3aRx\u65f6\uff0c\u5176\u6d88\u8017\u7684\u7535\u529f\u7387\u6700\u5927\u4e3aP\uff0c\u6839\u636eP=I2R\u6709\uff1a
P=I2Rx=(U\uff0f(Rx\uff0bR1))2•Rx\uff0c \uff0c\u6839\u636e\u6570\u5b66\u4e0a\u65b9\u7a0b \uff0c\u6709\u5b9e\u6570\u6839\u65f6\uff0c\u25b3=b2\uff0d4ac\u22650\u6c42\u89e3\u3002\u5c06\u4e0a\u5f0f\u6574\u7406\u4e3a\u5173\u4e8eRx\u7684\u4e00\u5143\u4e8c\u6b21\u65b9\u7a0b \uff0c\u56e0\u4e3aRx\u5b58\u5728\u4e14\u6709\u6b63\u6839\uff0c\u6240\u4ee5\u25b3=(20P\uff0d64)2\uff0d4\u00d7P\u00d7100P\u22650\uff0c\u89e3\u4e0d\u7b49\u5f0f\u5f97P\u22651.6\u74e6\uff0c\u6240\u4ee5R2\u6d88\u8017\u7684\u6700\u5927\u7535\u529f\u7387\u4e3a1.6\u74e6\uff0c\u5c06P=1.6\u74e6\u4ee3\u5165\u539f\u65b9\u7a0b\u53ef\u4ee5\u6c42\u5f97Rx=10\u03a9\u3002
\u3010\u540c\u6b65\u7ec3\u4e60\u3011
1.\u5982\u56fe4\u6240\u793a\u7535\u8def\uff0c\u7535\u6e90\u7535\u538b8\u4f0f\u4fdd\u6301\u4e0d\u53d8\uff0c\u7535\u963bR1=20\u6b27\uff0c
\u5f53\u5f00\u5173S\u95ed\u5408\u540e\uff0c\u7535\u538b\u8868 \u548c \u7684\u793a\u6570\u4e4b\u6bd4\u662f1\uff1a1\uff0c \u548c \u7684\u793a\u6570\u4e4b\u6bd4\u662f5\uff1a3\uff0c\u5219\u4e0b\u5217\u5224\u65ad\u6b63\u786e\u7684\u662f\uff08 \uff09
A. R2=20\u6b27 B. R3=30\u6b27
C.\u7535\u6d41\u8868 \u7684\u793a\u6570\u4e3a0.1\u5b89
D.\u7535\u8def\u4e2d\u6d88\u8017\u7684\u603b\u529f\u7387\u4e3a0.8\u74e6
2.\u5728\u56fe5\u6240\u793a\u7684\u7535\u8def\u4e2d\uff0c\u7535\u6e90\u7535\u538b\u548c\u7535\u706fL\u7684\u7535\u963b\u5747\u4fdd\u6301
\u4e0d\u53d8\u3002\u5f00\u5173S\u95ed\u5408\u540e\uff0c\u5728\u53d8\u963b\u5668\u7684\u6ed1\u7247P\u4ece\u4e2d\u70b9\u5411\u4e0b\u6ed1\u52a8\u7684\u8fc7\u7a0b\u4e2d\uff0c\u4e0b\u5217\u8bf4\u6cd5\u4e2d\u6b63\u786e\u7684\u662f\uff08 \uff09
A.\u7535\u538b\u8868\u7684\u793a\u6570\u53d8\u5927 B.\u7535\u706fL\u4eae\u5ea6\u4e0d\u53d8
C.\u7535\u6d41\u8868 \u7684\u793a\u6570\u4e0d\u53d8 D.\u7535\u6d41\u8868 \u7684\u793a\u6570\u53d8\u5c0f
3.\u7532\u706f\u6807\u660e10V\uff0c\u4e59\u706f\u6807\u660e4W\u3002\u7532\u3001\u4e59\u4e24\u706f\u7535\u963b\u5206\u522b\u4e3aR\u7532\uff1aR\u4e59\u3002
\u4e14R\u7532\uff1eR\u4e59\uff0c\u5e76\u4fdd\u6301\u4e0d\u53d8\u3002\u5c06\u5b83\u4eec\u4ee5\u67d0\u79cd\u65b9\u5f0f\u63a5\u5230\u7535\u538b\u4e3aU\u7684\u7535\u6e90\u4e0a\u65f6\uff0c\u4e24\u706f\u5747\u6b63\u5e38\u53d1\u5149\uff0c\u5c06\u5b83\u4eec\u4ee5\u53e6\u4e00\u79cd\u65b9\u5f0f\u8fde\u63a5\u5230\u7535\u538b\u4e3aU\u2032\u7684\u7535\u6e90\u4e0a\u65f6\uff0c\u4e59\u706f\u6b63\u5e38\u53d1\u5149\uff0c\u7532\u706f\u7684\u5b9e\u9645\u529f\u7387\u662f\u989d\u5b9a\u529f\u7387\u7684
16\uff0f25\uff0c\u5219U\u2032\u4e0eU\u7684\u6bd4\u503c\u4e3a\uff08 \uff09
A. 4\uff1a9 B. 9\uff1a4 C. 4\uff1a5 D. 5\uff1a4
4.\u4e00\u6839\u7535\u70ed\u4e1d\u7684\u7535\u963b\u503c\u4e3aR\uff0c\u5c06\u5b83\u63a5\u5728\u7535\u538b\u4e3aU\u7684\u7535\u8def\u4e2d\u65f6\uff0c\u5728\u65f6\u95f4t\u5185\u4ea7\u751f\u7684\u70ed\u91cf\u4e3aQ\u3002\u4f7f\u7528\u4e00\u6bb5\u65f6\u95f4\u540e\uff0c\u6bd4\u7535\u70ed\u7ebf\u88ab\u526a\u6389\u4e86\u4e00\u5c0f\u6bb5\uff0c\u5269\u4e0b\u4e00\u6bb5\u7684\u7535\u963b\u503c\u4e3a3\uff0f4R\u3002\u73b0\u5c06\u5269\u4e0b\u7684\u8fd9\u6bb5\u7535\u70ed\u4e1d\u63a5\u5165\u7535\u8def\uff0c\u5219\uff08 \uff09
A.\u82e5\u4ecd\u5c06\u5b83\u63a5\u5728\u7535\u538b\u4e3aU\u7684\u7535\u8def\u4e2d\uff0c\u5728\u65f6\u95f4t\u5185\u4ea7\u751f\u7684\u70ed\u91cf\u4e3a3\uff0f4Q
B.\u82e5\u4ecd\u5c06\u5b83\u63a5\u5728\u7535\u538b\u4e3aU\u7684\u7535\u8def\u4e2d\uff0c\u4ea7\u751f\u7684\u70ed\u91cf\u4e3aQ\uff0c\u6240\u9700\u65f6\u95f4\u4e3a3\uff0f4t
C.\u82e5\u5c06\u5b83\u63a5\u5165\u7535\u538b\u4e3a3\uff0f4U\u7684\u7535\u8def\u4e2d\uff0c\u5728\u65f6\u95f4t\u5185\u4ea7\u751f\u7684\u70ed\u91cf\u4e3a3\uff0f4Q
D.\u82e5\u5c06\u5b83\u63a5\u5165\u53e6\u4e00\u7535\u8def\uff0c\u5728\u65f6\u95f4t\u5185\u4ea7\u751f\u7684\u70ed\u91cf\u4ecd\u4e3aQ\uff0c\u8fd9\u4e2a\u7535\u8def\u7684\u7535\u538b\u4e3a3\uff0f4U
\u540c\u6b65\u7ec3\u4e60\u7b54\u6848\uff1a
1.BCD\uff1b2.BD\uff1b3.B\uff1b4.BC
P =UI =IIR=UU/R=Q
功能关系之类的
喂喂喂 我肿么不晓得 冀教版的物理八下 有这个内容
绛旓細鏂板崕涔﹀簵涓鑸簲璇ユ槸鏈夌殑锛屾瘮杈冨己澶
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绛旓細http://wxt.zxxkw.com/Class.asp?DownType=9&ClassID=45 杩欓噷鏈
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绛旓細閫塁 A鐨勮娉曢敊璇,涓嶆槸涓轰簡浣挎彙閽虫焺鏃剁殑鎵嬫帉鐥,鏄负浜嗙粷缂,闃叉鍦ㄥ伐浣滄椂婕忕數.B鐨勮娉曢敊璇,涓昏鏄负浜嗚鐢电嚎涓庡鐣岄殧缁.D杩欎簺鎺烘潅閲戝睘涓濈殑鍦版澶ф鏄负浜嗛櫎鍘讳汉浣撲笂鐨勯潤鐢.鍥犱负闈欑數鏈夊彲鑳藉奖鍝嶇數瀛﹁瘯楠岀殑缁撴灉.
绛旓細绉戝鏄皬瀛︺佸垵涓拰楂樹腑鐨勪竴闂ㄥ緢閲嶈鐨勫绉戙2017骞9鏈1鏃ュ紑濮嬶紝浠庡皬瀛︿竴骞寸骇寮濮嬩笂绉戝璇撅紙鏈垎绉戯級锛涘湪灏忓锛岀瀛﹁瀛︿範绉戝鐭ヨ瘑锛屽煿鍏诲鐢熺瀛︾礌鍏伙紝婵鍙戝鐢熸帰绌朵笘鐣岀殑鍏磋叮锛屼粠灏忓涓骞寸骇寮濮嬶紝灏嗙瀛︿綔涓哄熀纭鎬ц绋嬨傚湪涓冧腑鍗犳湁杈冮珮鐨勫垎鍊硷紙鍚勫湴鐨勫垎鍊间笉鍚岋級锛屽叾涓昏鍖呭惈浜鐗╃悊+鍖栧+鐢熺墿+鍦扮悊鍥...
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绛旓細鍒濅腑鐗╃悊鍏紡 鐗╃悊閲忥紙鍗曚綅锛 鍏紡 澶囨敞 鍏紡鐨勫彉褰 閫熷害V锛坢/S锛 v= S /t 锛圫:锛氳矾绋嬶紱 t锛:鏃堕棿 锛夐噸鍔汫锛圢锛 G=mg (m锛氳川閲忥紱g锛9.8N/kg鎴栬10N/kg)瀵嗗害蟻锛坘g/m3锛 蟻= m锛氳川閲/V锛氫綋绉 锛坢锛氳川閲忥紱V锛氫綋绉級娴姏F娴(N) F娴=G鐗┾擥娑 锛圙娑诧細鐗╀綋鍦ㄦ恫浣撶殑閲嶅姏锛夋诞鍔汧...
