Also known as: Watt
Watt (W) is the standard unit for measuring power, and it indicates the rate at which energy - for example electrical or electromagnetic energy - is radiated, absorbed, or dissipated.
One Watt is equivalent to using one Joule of energy per second. The RF and audio power available from a mobile phone will determine its capacity to provide good signal strength, which is necessary in order to maintain satisfactory communications with users on the phone network. There has to be a compromise however, as the higher the power used by the phone, then the greater will be the drain on its battery.
The power can be determined by calculating the product of the voltage and the current (i.e. Watts = Volts x Amps).