[問題] 傳統AC轉DC整流器電壓問題
剛才拿了幾個常見的手機座充用
黑色長方形的那種傳統式變壓器110AC轉7V或9VDC的變壓器
用三用電表量電壓
結果發現標示9VDC量測數值11VDC也有13VDC的
標示7VDC的量起來14VDC
是為了滿載的時候可能會產生的壓降所預留的嗎?
可是這樣後者也差太多了吧?
請教為什麼標示跟實際測量會差這麼多?
感謝
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