一旦出现电压有很多原因，比如电源电路上面出现电阻器较大的问题。如果这时候有较大的电流量，通过依据公式U等于电流量乘以电阻器，电源电路上会产生电压，会有安全隐患。可能是连接头出现松动的问题，或者超过它的负荷，就要替换更粗一点电线、电缆。
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