Enter the voltage and power into the calculator to determine the resistance of a heater. This calculator uses Ohm’s Law to calculate the resistance based on the provided electrical parameters.

Heater Resistance Formula

The following formula is used to calculate the resistance of a heater:

R = V^2 / P

Variables:

  • R is the resistance of the heater (Ohms)
  • V is the voltage applied to the heater (Volts)
  • P is the power consumed by the heater (Watts)

To calculate the resistance of a heater, square the voltage applied to the heater and divide by the power consumed by the heater.

What is Heater Resistance?

Heater resistance is the opposition that a heater element presents to the flow of electric current. It is a crucial parameter that determines the amount of heat generated by the heater when a specific voltage is applied. The resistance is measured in Ohms and can be calculated using Ohm’s Law, which relates the voltage, current, and resistance in an electrical circuit.

How to Calculate Heater Resistance?

The following steps outline how to calculate the Heater Resistance:


  1. First, determine the voltage (V) applied to the heater.
  2. Next, determine the power (P) consumed by the heater in Watts.
  3. Use the formula R = V^2 / P to calculate the resistance (R).
  4. Finally, calculate the Heater Resistance (R) in Ohms.
  5. 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.

Voltage (V) = 120 volts

Power (P) = 1500 watts