Enter the current (amps), the resistor resistance (ohms), and the time (min) into the Resistor Heat Calculator. The calculator will evaluate the Resistor Heat. 

Resistor Heat Formula

The following formula is used to calculate the Resistor Heat. 

RH = I^2*R*t


  • RH is the Resistor Heat (watt-hr)
  • I is the current (amps) 
  • R is the resistor resistance (ohms) 
  • t is the time (hr) 

How to Calculate Resistor Heat?

The following steps outline how to calculate the Resistor Heat.

  1. First, determine the current (amps).
  2. Next, determine the resistor resistance (ohms). 
  3. Next, determine the time (hr). 
  4. Next, gather the formula from above = RH = I^2*R*t.
  5. Finally, calculate the Resistor Heat.
  6. After inserting the variables and calculating the result, check your answer with the calculator above. 

Example Problem:

Use the following variables as an example problem to test your knowledge.

current (amps) = 10

resistor resistance (ohms) = 5

time (hr) = 6

RH = I^2*R*t =  ?