How to 转换 volts to ohms

You can 计算 ohms from volts and amps or watts, but you can't 转换 volts to ohms since volt and ohm units do not measure the same quantity.

According to ohm's law, the resistance R in ohms (Ω) is equal to the voltage V in volts (V) divided by the current I in amps (A):

R_(Ω) = V_(V) / I_(A)

So ohms are equal to volts divided by amps:

ohms = volts / amps

Ω = V / A

计算 the resistance in ohms of a resistor when the voltage is 5 volts and the current is 0.2 amps.

The resistance R is equal to 5 volts divided by 0.2 amps, which is equal to 25 ohms:

R = 5V / 0.2A = 25Ω

The power P is equal to the voltage V times the current I:

P = V × I

The current I is equal to the voltage V divided by the resistance R (ohm's law):

I = V / R

So the power P is equal to

P = V × V / R = V ² / R

So the resistance R in ohms (Ω) is equal to the square 值 of voltage V in volts (V) divided by the power P in watts (W):

R_(Ω) = V²_(V) / P_(W)

So ohms are equal to the square 值 of volts divided by watts:

ohms = volts² / watts

Ω = V² / W

计算 the resistance in ohms of a resistor when the voltage is 5 volts and the power is 2 watts.

The resistance R is equal to square of 5 volts divided by 2 watts, which is equal to 12.5 ohms.

R = (5V)² / 2W = 12.5Ω

See also