12V(V)是电压还是电流。A呢，又是什么 12V蓄电池没电的特征，电压、电流分别是什么情况
12V(V)\u662f\u7535\u538b\u8fd8\u662f\u7535\u6d41\uff1fA\u662f\u7535\u6d41\u8fd8\u662f\u7535\u538b\uff1fV\u662f\u7535\u538b
A\u662f\u7535\u6d41\u7684\u5355\u4f4d\uff1a\u5b89\u57f9
\u7535\u538b\uff0c\u4e5f\u79f0\u4f5c\u7535\u52bf\u5dee\u6216\u7535\u4f4d\u5dee\uff0c\u662f\u8861\u91cf\u5355\u4f4d\u7535\u8377\u5728\u9759\u7535\u573a\u4e2d\u7531\u4e8e\u7535\u52bf\u4e0d\u540c\u6240\u4ea7\u751f\u7684\u80fd\u91cf\u5dee\u7684\u7269\u7406\u91cf\u3002\u6b64\u6982\u5ff5\u4e0e\u6c34\u4f4d\u9ad8\u4f4e\u6240\u9020\u6210\u7684\u201c\u6c34\u538b\u201d\u76f8\u4f3c\u3002\u9700\u8981\u6307\u51fa\u7684\u662f\uff0c\u201c\u7535\u538b\u201d\u4e00\u8bcd\u4e00\u822c\u53ea\u7528\u4e8e\u7535\u8def\u5f53\u4e2d\uff0c\u201c\u7535\u52bf\u5dee\u201d\u548c\u201c\u7535\u4f4d\u5dee\u201d\u5219\u666e\u904d\u5e94\u7528\u4e8e\u4e00\u5207\u7535\u73b0\u8c61\u5f53\u4e2d\u3002\u7535\u538b\u7684\u56fd\u9645\u5355\u4f4d\u662f\u4f0f\u7279\uff08V\uff09\u30021\u4f0f\u7279\u7b49\u4e8e\u5bf9\u6bcf1\u5e93\u4ed1\u7684\u7535\u8377\u505a\u4e861\u7126\u8033\u7684\u529f\uff0c\u53731 V = 1 J/C\u3002\u7535\u538b\u7684\u56fd\u9645\u5355\u4f4d\u5236\u4e3a\u4f0f\u7279(V)\uff0c\u5e38\u7528\u7684\u5355\u4f4d\u8fd8\u6709\u6beb\u4f0f(mV)\u3001\u5fae\u4f0f(\u03bcV)\u3001\u5343\u4f0f(kV)\u7b49\u3002
\u79d1\u5b66\u4e0a\u628a\u5355\u4f4d\u65f6\u95f4\u91cc\u901a\u8fc7\u5bfc\u4f53\u4efb\u4e00\u6a2a\u622a\u9762\u7684\u7535\u91cf\u53eb\u505a\u7535\u6d41\u5f3a\u5ea6\uff0c\u7b80\u79f0\u7535\u6d41\u3002\u901a\u5e38\u7528\u5b57\u6bcd I\u8868\u793a\uff0c\u5b83\u7684\u5355\u4f4d\u662f\u5b89\u57f9\uff08\u5b89\u5fb7\u70c8\u00b7\u739b\u4e3d\u00b7\u5b89\u57f9\uff09\uff0c1775\u5e74\u20141836\u5e74\uff0c\u6cd5\u56fd\u7269\u7406\u5b66\u5bb6\u3001\u5316\u5b66\u5bb6\uff0c\u5728\u7535\u78c1\u4f5c\u7528\u65b9\u9762\u7684\u7814\u7a76\u6210\u5c31\u5353\u8457\uff0c\u5bf9\u6570\u5b66\u548c\u7269\u7406\u4e5f\u6709\u8d21\u732e\u3002\u7535\u6d41\u7684\u56fd\u9645\u5355\u4f4d\u5b89\u57f9\u5373\u4ee5\u5176\u59d3\u6c0f\u547d\u540d\uff09\uff0c\u7b80\u79f0\u201c\u5b89\u201d\uff0c\u7b26\u53f7 \u201cA\u201d\uff0c\u4e5f\u662f\u6307\u7535\u8377\u5728\u5bfc\u4f53\u4e2d\u7684\u5b9a\u5411\u79fb\u52a8\u3002
1\u3001\u989d\u5b9a\u7535\u538b 12 V \u7684\u7535\u74f6\uff0c\u5b83\u7684\u7ec8\u6b62\u5145\u7535\u7535\u538b\uff08\u4e5f\u53eb\u505a\u9650\u5236\u7535\u538b\uff09\u4e3a\u989d\u5b9a\u7535\u538b\u7684 1.2 \u500d\uff1a12 V \u00d7 1.2 \uff1d 14.4 V \u3002\u5145\u7535\u7535\u538b\u8fbe\u5230\u9650\u5236\u7535\u538b\uff0c\u7535\u74f6\u5c31\u5145\u8db3\u7535\u4e86\u3002
2\u3001\u5bb9\u91cf 45 Ah \u7684\u7535\u74f6\uff0c\u5341\u5c0f\u65f6\u653e\u7535\u7387\uff0845 Ah \u00f7 10 h\uff09\u4e3a 4.5 A \uff0c\u5c31\u662f\u8be5\u7535\u74f6\u7684\u6807\u51c6\u5145\u7535\u7535\u6d41\uff0c\u7535\u91cf\u7528\u5c3d\u7684 45 Ah \u7535\u74f6\uff0c\u91c7\u7528\u6807\u51c6\u5145\u7535\u7535\u6d41 4.5 A \uff0c\u9700\u8981\u5145\u7535 15 \u5c0f\u65f6\u5373\u53ef\u5145\u6ee1\u3002
3\u3001\u5145\u7535\u65b9\u5f0f\u6709\u4e24\u79cd\uff1a\u6052\u538b\u5145\u7535\u3001\u548c\u6052\u6d41\u5145\u7535\u3002\u3010\u6052\u538b\u5145\u7535\u7684\u7279\u5f81\u662f\uff1a\u7535\u74f6\u7535\u538b\u4e0a\u5347\u81f3\u9650\u5236\u7535\u538b\uff0c\u5c31\u5145\u7535\u5b8c\u6bd5\uff1b\u800c\u7eaf\u6052\u6d41\u5145\u7535\u7279\u5f81\uff0c\u662f\u9700\u8981\u638c\u63e1\u5145\u7535\u65f6\u95f4\u7684\u3011\u3002
4\u3001\u6052\u6d41\u5145\u7535\u5b8c\u6210\u540e\uff0c\u5e94\u8be5\u53ca\u65f6\u9000\u51fa\u5145\u7535\u64cd\u4f5c\uff0c\u7ee7\u7eed\u5145\u7535\u4f1a\u635f\u574f\u7535\u74f6\u7684\u3002
V是电压
A是电流的单位：安培
你好、V是电压、A是电流
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