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1 如圖所示,若電壓刻度每格1V,求該波形電壓有效值?
A 26V
B 26/3V
C 3V
D 2V
`V_(rms)` = `sqrt((3^2*2+(-1)^2*1+5^2*1+(-2)^2*2)/6)` = `sqrt(26/3)V`