Ohm's law, power, wire sizing, voltage drop, energy cost and solar. 2 calculators.
Enter any two of voltage, current and resistance to find the third and the power in watts, using V = I × R and P = V × I.
Work out how many kilowatt-hours an appliance uses and what it costs to run per day, month and year from its watts, hours of use and your electricity rate.
Paint, flooring, drywall, insulation and other materials for projects around the house.
Fuel costs, financing, towing capacity, maintenance and vehicle ownership.
Percentages, averages, areas, volumes, triangles and everyday arithmetic.