Online calculator for calculating voltage, current, resistance and power

To calculate the voltage * U *, the current * I *,
the resistance * R * or the power * P * two of the values must be known.

Enter the __ two __ known values

## Calculate voltage |
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\(\displaystyle U=R · I\) |
\(\displaystyle U=\sqrt{P · R}\) |
\(\displaystyle U=\frac{P}{I}\) |

## Calculate current |
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\(\displaystyle I=\sqrt{\frac{P}{R}}\) |
\(\displaystyle I=\frac{U}{R}\) |
\(\displaystyle I=\frac{P}{U}\) |

## Calculate resistance |
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\(\displaystyle R=\frac{P}{I^2}\) |
\(\displaystyle R=\frac{U^2}{P}\) |
\(\displaystyle R=\frac{U}{I}\) |

## Calculate electrical power |
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\(\displaystyle P=U · I\) |
\(\displaystyle P=I^2·R\) |
\(\displaystyle P=\frac{U^2}{R}\) |