This page has a calculator for ohms law, power, and energy, This is a very basic collection of calculators to try to make some things a little bit easier to understand.
DC Ohm's Law & Power Calculator Made with Gemini; formulas V=IR, P=IV
For Ohm's Law & Power: Enter any two values (V, I, R, P).
Energy Calculation; formulas A*time,W*time
Energy calculations use Time and values from Ohm's Law section.