手機及藍牙耳筒充電問題

想請問一下, 0.7A 是否等於700mA?

無錯，0.7A是等於700mA。

另外, 這兩個火牛可以共用嗎?

未必可以共用。
首先要兩個火牛的輸出端要同一類型，例如：miniUSB...
另外因藍牙火牛的輸出雖然與手機火牛的輸電壓是一樣，是5.0V，但電流明顯不足夠供給手機使用。
電流不足，會令到充電時間增加，又或者不能充電。
而有部份保護線路做得不夠好的電子器具，如輸入過大電流(即使只是高少許)，會立即燒壞。
至於電壓過大，亦會有機會令電子零件破壞。
而根據經驗，藍牙火牛用在手機多數不夠力充電的。
如要交換用，可試把手機火牛共用在手機及藍牙耳機吧。



希望以上資料可以幫到你，有問題歡迎再問。

You have first to make sure that how large is the charging current for your appliances.

The current specified on the transformer is the maximum current that the tranformer can delivered. Currents higher than that specified may lead to overheating, hence possible damage to the transformer.

Hence, if during charging of your mobile, a current of 650 mA, say, is delivered by the transfomrer, then using the other one with 5v, 450 mA specification will lead to overheating.

On the other hand, the transformer with 5v, 700 mA specification can be used safely to charge your ear-phone, as the demanding current would not exceed 450 mA.

The actual current drawn from the transformer during a charging process depends on the load. It is only that using a transformer capable of delivering a larger output current will shorten the charging time to the battery in your appliance.