How to Use Joule Heating Calculator
- Pick the formula — I²Rt, VIt, or V²t/R.
- Enter the required variables — Current (A), voltage (V), resistance (Ω), time (s).
- Read Q and P — The Joule Heating Calculator reports heat in joules and instantaneous power in watts.
Formula & Theory - Joule Heating Calculator
P = I² · R = V · I = V² / R
Q = P · t
with units P [W], Q [J], I [A], V [V], R [Ω], t [s].| Symbol | Meaning |
|---|---|
| Q | Heat generated (J) |
| P | Electrical power dissipated (W) |
| I | Current (A) |
| V | Voltage across the resistor (V) |
| R | Resistance (Ω) |
| t | Duration (s) |
Assumptions and Limits
- The resistance R is constant and dissipates all electrical power as heat.
- For AC use RMS values; transient inductor/capacitor effects are not included.
Use Cases for Joule Heating Calculator
- Wire sizing — Estimate temperature rise in a conductor.
- Heating element design — Compute energy delivered by a kettle, soldering iron, etc.
- Electronics safety — Predict component heating for a given current.
The Joule Heating Calculator turns three numbers into heat output in seconds.