Online pulse energy calculator helps designers select the right wirewound resistor

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The calculator is well suited for selecting wirewound resistors to be used in applications exposed to large pulses such as a capacitive charge/discharge or lightning surge, including phone towers, solar power systems, windmills, welders, test equipment, and power supplies.

Simple to use, Joule School offers designers a choice of three pulse types to calculate: square wave pulse, capacitive charge/discharge pulse, and exponentially decaying pulse. After selecting the pulse type, users enter the required variables for their application and click "Compute" to determine the pulse energy and average power. To help determine the best wirewound resistor to meet the needs of their application, designers can then contact Vishay with the pulse information.  

The tool is available at

Visit Vishay Intertechnology at


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