初中物理
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3\uff0e\u6d6e\u529b\u8ba1\u7b97\u516c\u5f0f\uff1aF\u6d6e\uff1dG-T\uff1d\u03c1\u6db2gV\u6392\uff1dF\u4e0a\u3001\u4e0b\u538b\u529b\u5dee
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\u89e3\uff1a\u7531\u4e8eP\uff1d3\u74e6\uff0cU\uff1d6\u4f0f
\u2234I\uff1dP\uff0fU\uff1d3\u74e6\uff0f6\u4f0f\uff1d0.5\u5b89
\u7531\u4e8e\u603b\u7535\u538b8\u4f0f\u5927\u4e8e\u7535\u706f\u989d\u5b9a\u7535\u538b6\u4f0f\uff0c\u5e94\u4e32\u8054\u4e00\u53ea\u7535\u963bR2 \u5982\u53f3\u56fe\uff0c
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\u2234R2\uff1dU2\uff0fI\uff1d2\u4f0f\uff0f0.5\u5b89\uff1d4\u6b27\u3002\u7b54\uff1a\uff08\u7565\uff09
\u248d\u5e76\u8054\u7535\u8def\u7279\u70b9\uff1a
\u2460U\uff1dU1\uff1dU2 \u2461I\uff1dI1\uff0bI2 \u24621/R\uff1d1/R1+1/R2 \u6216 \u2463I1R1\uff1dI2R2
\u7535\u963b\u4e0d\u540c\u7684\u4e24\u5bfc\u4f53\u5e76\u8054\uff1a\u7535\u963b\u8f83\u5927\u7684\u901a\u8fc7\u7684\u7535\u6d41\u8f83\u5c0f\uff0c\u901a\u8fc7\u7535\u6d41\u8f83\u5927\u7684\u5bfc\u4f53\u7535\u963b\u5c0f\u3002
\u4f8b\uff1a\u5982\u56feR2\uff1d6\u6b27,K\u65ad\u5f00\u65f6\u5b89\u57f9\u8868\u7684\u793a\u6570\u4e3a0.4\u5b89\uff0cK\u95ed\u5408\u65f6\uff0cA\u8868\u793a\u6570\u4e3a1.2\u5b89\u3002\u6c42\uff1a\u2460R1\u963b\u503c \u2461\u7535\u6e90\u7535\u538b \u2462\u603b\u7535\u963b
\u5df2\u77e5\uff1aI\uff1d1.2\u5b89 I1\uff1d0.4\u5b89 R2=6\u6b27
\u6c42\uff1aR1\uff1bU\uff1bR
\u89e3\uff1a\u2235R1\u3001R2\u5e76\u8054
\u2234I2\uff1dI-I1=1.2\u5b89-0.4\u5b89=0.8\u5b89
\u6839\u636e\u6b27\u59c6\u5b9a\u5f8bU2=I2R2=0.8\u5b89\u00d76\u6b27=4.8\u4f0f
\u53c8\u2235R1\u3001R2\u5e76\u8054 \u2234U=U1=U2=4.8\u4f0f
\u2234R1\uff1dU1\uff0fI1\uff1d4.8\u4f0f\uff0f0.4\u5b89\uff1d12\u6b27
\u2234R\uff1dU\uff0fI\uff1d4.8\u4f0f\uff0f1.2\u5b89\uff1d4\u6b27 (\u6216\u5229\u7528\u516c\u5f0f \u8ba1\u7b97\u603b\u7535\u963b) \u7b54\uff1a\uff08\u7565\uff09
\u5341\u4e8c\u3001\u7535\u80fd
\u2488\u7535\u529fW\uff1a\u7535\u6d41\u6240\u505a\u7684\u529f\u53eb\u7535\u529f\u3002\u7535\u6d41\u4f5c\u529f\u8fc7\u7a0b\u5c31\u662f\u7535\u80fd\u8f6c\u5316\u4e3a\u5176\u5b83\u5f62\u5f0f\u7684\u80fd\u3002
\u516c\u5f0f\uff1aW\uff1dUQ W\uff1dUIt=U2t/R=I2Rt W\uff1dPt \u5355\u4f4d\uff1aW\u7126 U\u4f0f\u7279 I\u5b89\u57f9 t\u79d2 Q\u5e93 P\u74e6\u7279
\u2489\u7535\u529f\u7387P\uff1a\u7535\u6d41\u5728\u5355\u4f4d\u65f6\u95f4\u5185\u6240\u4f5c\u7684\u7535\u529f\uff0c\u8868\u793a\u7535\u6d41\u4f5c\u529f\u7684\u5feb\u6162\u3002\u3010\u7535\u529f\u7387\u5927\u7684\u7528\u7535\u5668\u7535\u6d41\u4f5c\u529f\u5feb\u3002\u3011
\u516c\u5f0f\uff1aP\uff1dW/t P\uff1dUI (P\uff1dU2/R P\uff1dI2R) \u5355\u4f4d\uff1aW\u7126 U\u4f0f\u7279 I\u5b89\u57f9 t\u79d2 Q\u5e93 P\u74e6\u7279
\u248a\u7535\u80fd\u8868\uff08\u74e6\u65f6\u8ba1\uff09\uff1a\u6d4b\u91cf\u7528\u7535\u5668\u6d88\u8017\u7535\u80fd\u7684\u4eea\u8868\u30021\u5ea6\u7535\uff1d1\u5343\u74e6\u65f6\uff1d1000\u74e6\u00d73600\u79d2=3.6\u00d7106\u7126\u8033
\u4f8b\uff1a1\u5ea6\u7535\u53ef\u4f7f\u4e8c\u53ea\u201c220V\u300140W\u201d\u7535\u706f\u5de5\u4f5c\u51e0\u5c0f\u65f6\uff1f
\u89e3 t\uff1dW/P\uff1d1\u5343\u74e6\u65f6/\uff082\u00d740\u74e6\uff09\uff1d1000\u74e6\u65f6/80\u74e6=12.5\u5c0f\u65f6
\u5341\u4e09\u3001\u78c1
1\uff0e\u78c1\u4f53\u3001\u78c1\u6781\u3010\u540c\u540d\u78c1\u6781\u4e92\u76f8\u6392\u65a5\uff0c\u5f02\u540d\u78c1\u6781\u4e92\u76f8\u5438\u5f15\u3011
\u7269\u4f53\u80fd\u591f\u5438\u5f15\u94c1\u3001\u94b4\u3001\u954d\u7b49\u7269\u8d28\u7684\u6027\u8d28\u53eb\u78c1\u6027\u3002\u5177\u6709\u78c1\u6027\u7684\u7269\u8d28\u53eb\u78c1\u4f53\u3002\u78c1\u4f53\u7684\u78c1\u6781\u603b\u662f\u6210\u5bf9\u51fa\u73b0\u7684\u3002
2\uff0e\u78c1\u573a\uff1a\u78c1\u4f53\u5468\u56f4\u7a7a\u95f4\u5b58\u5728\u7740\u4e00\u4e2a\u5bf9\u5176\u5b83\u78c1\u4f53\u53d1\u751f\u4f5c\u7528\u7684\u533a\u57df\u3002
\u78c1\u573a\u7684\u57fa\u672c\u6027\u8d28\u662f\u5bf9\u653e\u5165\u5176\u4e2d\u7684\u78c1\u4f53\u4ea7\u751f\u78c1\u529b\u7684\u4f5c\u7528\u3002
\u78c1\u573a\u65b9\u5411\uff1a\u5c0f\u78c1\u9488\u9759\u6b62\u65f6N\u6781\u6240\u6307\u7684\u65b9\u5411\u5c31\u662f\u8be5\u70b9\u7684\u78c1\u573a\u65b9\u5411\u3002\u78c1\u4f53\u5468\u56f4\u78c1\u573a\u7528\u78c1\u611f\u7ebf\u6765\u8868\u793a\u3002
\u5730\u78c1\u5317\u6781\u5728\u5730\u7406\u5357\u6781\u9644\u8fd1\uff0c\u5730\u78c1\u5357\u6781\u5728\u5730\u7406\u5317\u6781\u9644\u8fd1\u3002
3\uff0e\u7535\u6d41\u7684\u78c1\u573a\uff1a\u5965\u65af\u7279\u5b9e\u9a8c\u8868\u660e\u7535\u6d41\u5468\u56f4\u5b58\u5728\u78c1\u573a\u3002
\u901a\u7535\u87ba\u7ebf\u7ba1\u5bf9\u5916\u76f8\u5f53\u4e8e\u4e00\u4e2a\u6761\u5f62\u78c1\u94c1\u3002
\u901a\u7535\u87ba\u7ebf\u7ba1\u4e2d\u7535\u6d41\u7684\u65b9\u5411\u4e0e\u87ba\u7ebf\u7ba1\u4e24\u7aef\u6781\u6027\u7684\u5173\u7cfb\u53ef\u4ee5\u7528\u53f3\u624b\u87ba\u65cb\u5b9a\u5219\u6765\u5224\u5b9a\u3002
即220*220/2200=22欧
电炉正常工作的电阻为22欧
电流的平方乘以电子就是电炉的实际功率
即8*8*22=1408瓦
实际功率为1408瓦
某电炉的额定功率是2200W，额定电压是220V，接入电路时，测得通过他的电流是8A，求此电炉的电阻和实际功率是多少？
R=U^2/P=(220V)^2/2200W=22欧
P实=I^2R=(8A)^2*22欧=1408W
由前面的可以得出他的电阻，电阻=电压的平方/功率，而实际功率=电流的平方*电阻，只能说到这里了
电阻是27.5欧姆，功率是1760W
R=U额平方/P额=22欧姆
P实=I平方*R=1408瓦
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