Copper Loss Calculator

Learn about copper loss and how to calculate it using the Copper Loss Calculator. Understand the formula, its applications in real life, and the importance of copper loss calculations in engineering.

Copper Loss Calculator
Primary Winding Current Ampere
Primary Winding Ohmic Resistance ohm
Secondary Winding Current Ampere
Secondary Winding Ohmic Resistance ohm
Copper Loss Calculator Results
Copper Loss = watts
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Introduction to Copper Loss

Copper loss is a significant factor to consider in electrical systems, particularly in applications where copper conductors are used to transmit electric power. Copper, being a conductor with relatively low resistance, still possesses resistance that leads to energy losses in the form of heat. These energy losses are known as copper losses and can have a substantial impact on the overall efficiency of electrical systems.

Understanding and quantifying copper loss is crucial for engineers and designers working on electrical systems to ensure optimal performance and cost-effectiveness. The Copper Loss Calculator provides a convenient tool to estimate copper losses based on the electrical parameters and characteristics of the system.

The Copper Loss Formula

The copper loss in an electrical conductor can be calculated using the following formula:

Copper Loss = I2 × R


  • Copper Loss is the energy lost as heat due to the resistance of the copper conductor (in watts)
  • I is the current flowing through the conductor (in amperes)
  • R is the resistance of the copper conductor (in ohms)

The formula indicates that the copper loss is directly proportional to the square of the current and the resistance of the conductor. As the current increases or the resistance rises, the copper loss also increases.

Applications in Real Life

The calculation of copper loss finds extensive applications in various electrical engineering domains. Here's an example scenario illustrating the practical use of the Copper Loss Calculator:

Example: Transformer Copper Loss Calculation

Suppose you are designing a power transformer for an industrial facility. The transformer has the following specifications:

  • Primary voltage: 480V
  • Secondary voltage: 120V
  • Rated power: 500kVA
  • Transformer winding resistance: 0.1Ω

To calculate the copper loss in the transformer, you need to determine the primary and secondary currents using the formula:

I = P / V


  • I is the current (in amperes)
  • P is the power (in watts)
  • V is the voltage (in volts)

Using the formula, you can calculate the primary and secondary currents:

Primary Current (IP) = 500,000 / 480 = 1,041.67 A
Secondary Current (IS) = 500,000 / 120 = 4,166.67 A

Now, you can use the copper loss formula to calculate the copper loss in the transformer:

Copper Loss = IP2 × R

Substituting the values:

Copper Loss = (1,041.67)2 × 0.1 = 108,680.56 W

Therefore, the copper loss in the transformer is approximately 108,680.56 watts.

This calculation is essential for transformer design and operation as it helps determine the amount of energy that will be dissipated as heat due to copper losses. It enables engineers to select appropriate conductor sizes and materials to minimize energy losses and enhance the overall efficiency of the transformer.

Importance of Copper Loss Calculations

Copper loss calculations play a crucial role in the design, operation, and maintenance of electrical systems. Some key reasons why copper loss calculations are important include:

  • Efficiency Optimization: By quantifying copper losses, engineers can make informed decisions about conductor sizing, material selection, and system configuration to maximize energy efficiency and minimize operational costs.
  • Heat Dissipation: Copper losses result in the generation of heat. Accurate calculations help ensure proper heat dissipation measures are in place to prevent overheating of conductors and associated components.
  • Economic Considerations: Copper is an expensive material, and minimizing copper losses helps optimize material usage, reducing overall project costs without compromising performance.
  • Safety: Copper losses can contribute to elevated temperatures, which can pose safety risks. Accurate calculations help ensure compliance with safety standards and prevent hazardous conditions.
  • Environmental Impact: By minimizing copper losses, energy efficiency is improved, leading to reduced energy consumption and lower environmental impact.


The Copper Loss Calculator provides a valuable tool for engineers to estimate and analyze the copper losses in electrical systems. By understanding the formula and applications of copper loss calculations, engineers can make informed decisions to optimize system efficiency, reduce energy waste, and enhance overall performance. Proper consideration of copper losses in design and operation contributes to sustainable and cost-effective electrical systems.