如何转换 电压 中的 伏特 (V) 到 电阻 中的 欧姆 (Ω).
您可以通过伏特和 安培 或 瓦特, but you can't convert volts 到 ohms s中的ce volt and ohm units do not measure the same quantity.
Acc或d中的g 到 欧姆定律, the resistance R 中的 欧姆 (Ω) is equal 到 the voltage V 中的 伏特 (V) divided by the current I in 安培 (A):
R(Ω) = V(V) / I(A)
So ohms are equal 到 volts divided by 安培:
欧姆 = 伏特² / 安培
或
Ω = V² / A
Calculate the resistance 中的 ohms of a resis到r when the voltage is 5 volts and the current is 0.2 安培.
The resistance R is equal 到 5 volts divided by 0.2 安培, which 等于 25 ohms:
R = 5V / 0.2A = 25Ω
功率 P is equal 到 the voltage V 乘以电流 I:
P = V × I
电流 I is equal 到 the voltage V 除以电阻 R (欧姆定律):
I = V / R
所以功率 P is equal 到
P = V × V / R = V 2 / R
因此电阻 R 中的 欧姆 (Ω) is equal 到 the square value of voltage V 中的 伏特 (V) divided by the power P 中的 瓦特 (W):
R(Ω) = V 2(V) / P(W)
So ohms are equal 到 the square value of volts divided by 瓦特:
欧姆 = 伏特²2 / 瓦特
或
Ω = V²2 / W
Calculate the resistance 中的 ohms of a resis到r when the voltage is 5 volts and the power is 2 瓦特.
The resistance R is equal 到 square of 5 volts divided by 2 瓦特, which 等于 12.5 ohms.
R = (5V)²2 / 2W = 12.5Ω
