Ohm's Law
Calculators and formulas for U, I, and R according to Ohm's Law
This function calculates the voltage U, the current I, or the resistance R according to Ohm's Law.
Select the value to be calculated and enter the two known values, then click the 'Calculate' button.
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Applications of Ohm's Law
Calculating Simple Circuits
Ohm's law is the most important law for calculating electrical circuits, since they generally consist of metallic conductors to which it applies.
In its original form, \(\displaystyle R=\frac{U}{I} \), Ohm's law is used to determine
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of the resistance from a current and voltage measurement:
\[ R = \frac{U}{I} \]
if U is known in volts and I in amperes:
\[ 1\; Ω=\frac{1\;V}{1\;A} \]
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the current in the form solved for I:
\[ I=\frac{U}{R} \]
if I is known in amperes and R in ohms:
\[ 1\;A=\frac{1\;V}{1\;Ω} \]
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the voltage in the form solved for U:
\[ U=I·R \]
if I is known in amperes and R in ohms:
\[ 1\;V=1\;A·1\;Ω \]
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