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The Joule's Law Calculator will calculate the:

- Output (useful) energy (heat energy for resistors) delivered by a circuit component
- Input (total) energy produced by the electric source of the circuit (battery)

**Calculator Settings:**

- Medium is considered as uniform.
- The wire is considered at the same thickness everywhere.
- Enter 0 [zero] when an input is not known, the Joule's Law Calculator will automatically select the appropriate Joule's Law formula to complete the calculations.

The useful energy delivered by the circuit component is J [Joule] |

The total energy produced by the source is J [Joule] |

Useful energy of circuit component calculations |
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When current and potential difference of circuit component are given but not the resistance of the component W = I × ∆V × t W = × × W = When current and resistance of circuit component are given but not the potential difference W = I ^{2} × R × tW = ^{2} × × W = × × W = When potential difference and resistance of circuit component are given but not the current W = × t∆V^{2}/RW = × t^{2}/W = × t/W = × tW = |

Total energy of source calculations |

When current and emf of battery are given but not the total resistance of the circuit E = I × ε × t E = × × E = When current and total resistance of circuit are given but not the emf of battery E = I ^{2} × R_{tot} × tE = ^{2} × × E = × × E = When emf of battery and total resistance of circuit are given but not the current E = × tε^{2}/R_{tot}E = × ^{2}/E = × /E = × E = |

Joules Law Calculator Input Values |

Current flowing through the circuit (I) A [Amp] |

Electromotive force of battery (ε) V [Volt] |

Potential difference across the circuit component (ΔV) V [Volt] |

Resistance of the circuit component (R) Ω [Ohm] |

Operating time (t) s [second] |

Total resistance of the circuit (R_{tot}) Ω [Ohm] |

Please note that the formula for each calculation along with detailed calculations are available below. As you enter the specific factors of each joules law calculation, the Joules Law Calculator will automatically calculate the results and update the Physics formula elements with each element of the joules law calculation. You can then email or print this joules law calculation as required for later use.

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a) When current and potential difference of circuit component are given but not the resistance of the component

W = I × ∆V × t

b) When current and resistance of circuit component are given but not the potential difference

W = I^{2} × R × t

c) When potential difference and resistance of circuit component are given but not the current

W = *∆V*^{2}*/**R* × t

a) When current and emf of battery are given but not the total resistance of the circuit

E = I × ε × t

b) When current and total resistance of circuit are given but not the emf of battery

E = I^{2} × R_{tot} × t

c) When emf of battery and total resistance of circuit are given but not the current

E = *ε*^{2}*/**R*_{tot} × t

The following Physics tutorials are provided within the Electrodynamics section of our Free Physics Tutorials. Each Electrodynamics tutorial includes detailed Electrodynamics formula and example of how to calculate and resolve specific Electrodynamics questions and problems. At the end of each Electrodynamics tutorial you will find Electrodynamics revision questions with a hidden answer that reveals when clicked. This allows you to learn about Electrodynamics and test your knowledge of Physics by answering the test questions on Electrodynamics.

- 15.1 - Electric Current. Current Density
- 15.2 - Electric Resistance. Combinations of Resistors
- 15.3 - Electric Potential Difference (Voltage). Ohm's Law
- 15.4 - Electric Circuits. Series and Parallel Circuits. Short Circuits
- 15.5 - Kirchhoff Laws
- 15.6 - Electric Power and Efficiency
- 15.7 - RC Circuits
- 15.8 - Miscellaneous

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