The physical concept is a measure of how much work is done during a unit of time. The SI unit for power is watts (W) which is the same as joules per second. The calculation is made for direct current and direct voltage.
The power factor is the ratio between the active power (W) and the apparent power (VA) supplied by the power source.
The active effect is the effect that performs actual work in an appliance / machine while the apparent effect is the actual effect that the machine / appliance draws from the electricity grid.
Electrical power is the power that can perform a job such as operating a device.
Phase corresponds to current wiring usually in Sweden, this means that a connection between 1 phase and a neutral conductor gives 230V while a connection between 2 phases gives 400V.
Voltage is defined as the difference between electrical potential between 2 different points. Voltage is measured in volts (V).
Current is the movement of charged particles per unit of time. Current is measured in Ampere (A) and is defined as the Current passing through two straight parallel conductors of infinite length at a distance of one meter from each other.
The time during which the energy is used to create a work.
Electrical energy is defined as the mechanical work needed to move a charge. The energy is usually measured in the SI unit Joule (J) which is the same as wattsecond (Ws).
When numbers with these units normally become very small, watt hours (Wh) and kilowatt hours (kWh) are often used.