Electric Power Calculator

Calculate the electrical power in watts from the voltage in volts and the amperage in amperes. The formula is very simple, P = U * I. The units are calculated as 1W = 1V * 1A. Prefixes like kilo, mega, ... can be chosen arbitrarily.

Example: at a voltage of 20 kV and an amperage of 80 mA, the electrical power is 1600 W.

Power can be viewed as the force that converts energy. It is a quantity independent of time, in contrast to the energy that is converted over a specific period of time. This does not mean, of course, that power cannot change over time. If the converted energy is electrical energy, i.e., electricity is generated or consumed, then the power is electrical power. Conversely, power is energy per unit of time, and electrical power is simply electrical energy per unit of time. The unit of power is the watt, or, for high powers, kilowatts and megawatts, for low powers, milliwatts, and so on. Unlike many other physical quantities, power does not have a confusing jumble of many different units; the watt has been the standard unit of power worldwide since the middle of the 20th century. Unfortunately, watts and watt-hours are often confused; particularly in the field of electricity, kilowatt-hours are often mistakenly referred to as kilowatts by laypeople. However, watt units with a time ending, such as kilowatt-hours, represent energy, not power. The energy one kilowatt hour is the power of one kilowatt for one hour duration, or, for example, two kilowatts for half an hour.
Electrical devices usually have a power rating specified. This is often an upper limit for the device. Some devices, such as computer power supplies or photovoltaic modules, rarely reach this limit, while others, such as boiling kettles or vacuum cleaners, very frequently do so.