JUJUMI工程计算器 · Engineering Calculators

Joule's Law

Compute heat Q = I² R t from current, resistance and time; reverse for I, R or t; output in J and kJ.

Inputs

Formula

Q = I² R t
Heat scales with I²; used in heater and overcurrent design.

How to use

  1. Fill in Current I, Resistance R, Time t in the Inputs section (watch the unit on each field).
  2. Click Calculate; the tool evaluates the formula shown above.
  3. Read Heat Q, Heat Q (kJ) in the results area.
Formula notesJoule's law heat Q = I²·R·t (I current, R resistance, t time).