This calculator is designed to help users calculate power, voltage, current, and resistance. Depending on the equation selected on the wheel, the user is prompted to input the appropriate values. This makes it easy for users to quickly calculate the desired value without having to manually input all the necessary information.

In addition to its calculation capabilities, this calculator also features a history function. This allows users to easily access the results of previous calculations. For example, if a user wants to know the results of a power calculation they did just a minute ago, they can simply swipe over to the next screen and find it listed under history. This feature makes it easy for users to keep track of their calculations and reference them later on.

Overall, this calculator is a useful tool for anyone who needs to perform power, voltage, current, or resistance calculations. Its intuitive interface and history function make it easy to use and reference, while its prompt system ensures that users input the correct values for each equation.