一辆电动自行车的铭牌上给出了如下的技术参数表： 规 格 一辆电动自行车的铭牌上给出了如下的技术参数： ...
\u4e00\u8f86\u7535\u52a8\u81ea\u884c\u8f66\u7684\u94ed\u724c\u4e0a\u7ed9\u51fa\u4e86\u5982\u4e0b\u7684\u6280\u672f\u53c2\u6570\u8868\uff0e \u89c4\u683c \u540e\u7531\u8868\u683c\u8bfb\u51fa\u7535\u673a\u7684\u989d\u5b9a\u7535\u538bU=40V\uff0c\u989d\u5b9a\u7535\u6d41I=4A\uff0c\u989d\u5b9a\u8f93\u51fa\u529f\u7387P \u51fa =120W\uff0e\uff081\uff09\u7535\u673a\u8f93\u5165\u7684\u662f\u7535\u529f\u7387\uff0c\u603b\u529f\u7387\u7b49\u4e8e\u7535\u529f\u7387\uff0c\u5f97\u5230P \u603b =IU=40\u00d74W=160W \u6839\u636e\u80fd\u91cf\u5b88\u6052\u5f97\uff0c\u5185\u90e8\u53d1\u70ed\u529f\u7387P \u70ed =P \u603b -P \u51fa \uff0c\u53c8P \u70ed =I 2 r\u5219\u6709P \u603b -P \u51fa =I 2 r r= P \u603b - P \u51fa I 2 = 160-120 4 2 A=2.5A \uff082\uff09\u7535\u673a\u6b63\u5e38\u5de5\u4f5c\u65f6\u7684\u6548\u7387\u03b7= P \u51fa P \u603b =75%\uff083\uff09\u5728\u989d\u5b9a\u7535\u538b\u4e0b\uff0c\u7535\u673a\u7a81\u7136\u5361\u6b7b\u65f6\uff0c\u7535\u673a\u7535\u8def\u662f\u7eaf\u7535\u963b\u7535\u8def\uff0c\u6b27\u59c6\u5b9a\u5f8b\u6210\u7acb\uff0c\u5219\u6709P= U 2 r =640W\u7b54\uff1a\uff081\uff09\u6b64\u8f66\u7535\u673a\u7684\u5185\u963b\u662f2.5\u03a9\uff1b\uff082\uff09\u7535\u673a\u6b63\u5e38\u5de5\u4f5c\u65f6\u7684\u6548\u7387\u662f75%\uff1b\uff083\uff09\u5728\u989d\u5b9a\u7535\u538b\u4e0b\uff0c\u7535\u673a\u7a81\u7136\u5361\u6b7b\u65f6\uff0c\u7535\u673a\u7684\u603b\u529f\u7387\u662f640W\uff0e
\u7535\u52a8\u673a\u7684\u8f93\u5165\u7684\u529f\u7387\u4e3a P \u5165 =UI \u2460 \u53c8\u7531\u4e8e P \u5165 =P \u5185 +P \u8f93\u51fa \u2461\u7535\u52a8\u673a\u7684\u53d1\u70ed\u7684\u529f\u7387\u4e3a P \u5185 =I 2 r \u2462\u8054\u7acb\u2460\u2461\u2462\u4ee3\u5165\u6570\u636eP \u8f93\u51fa =120W\uff0cU=40V\uff0cI=3.5A\uff0c\u89e3\u5f97P \u5165 =140W\uff0cr=1.63\u03a9\uff0c\u7535\u52a8\u673a\u7684\u6548\u7387\u4e3a \u03b7= P \u8f93\u51fa P \u5165 \u00d7100% = 120 140 =\u00d7100%=85.7% \uff0e\u6240\u4ee5\u7535\u52a8\u673a\u6b63\u5e38\u5de5\u4f5c\u65f6\u7684\u6d88\u8017\u603b\u529f\u7387\u4e3a140W\uff0c\u7535\u52a8\u673a\u7684\u6548\u7387\u4e3a85.7%\uff0c\u7535\u52a8\u673a\u7684\u5185\u963b\u4e3a1.63\u03a9\uff0e
| 从表格数据中读出额定电压为40V，额定电流为3，5A； 故额定功率为：P=UI=40×3.5=140W； 故选B． |
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