Lower the pressure and largen the current of common electric current through transformer.
● 
用普通电流
变压器作用,使电压降低而电流变大。
电流Lower the pressure and largen the current of common electric current through transformer.
● 
用普通电流
变压器作用,使电压降低而电流变大。
To make an electromagnet you need to send a current through the wire.
为了做成电磁体你
要对金属线送电。
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