電力白痴
想問電力既問題
switch既火牛input標100~240V 1A
output就15V 2.6A
一個牆身插座可以負荷13A
咁計switch佔用左13A既幾多
應該計INPUT既火數定OUTPUT
因為見好多火牛個INPUT都遠大於OUTPUT
求其就咁當個 ideal transformer 嘅話:
Pin = Pout
UK: => Iin(RMS) * 240V = 2.6A * 15V
=> Iin = 0.163A
or
HK: => Iin(RMS) * 220V = 2.6A * 15V
=> Iin = 0.177A
但係 real transformer 有 loss,同埋 AC to DC 仲有 rectifier + regulator (宜家通常係 switching regulator),而 100-240VAC input 嘅牛仲有額外嘅 circuit 去 handle 唔同嘅 input voltage
求其當佢係 Pin = Pout + Ploss 就差唔多
呀唔係,switched mode power supply 唔可以就咁用 RMS power 同埋 RMS current
依啲唔記得晒