Which unit is used to measure electrical power?

The unit used to measure electrical power is the watt. Power in an electrical context is defined as the rate at which electrical energy is transferred by an electric circuit. One watt is equivalent to one joule per second, and it is calculated by multiplying voltage (measured in volts) by current (measured in amperes). In practical terms, when using equipment in an esthetic setting, understanding that power consumption is measured in watts helps practitioners assess the energy requirements of various devices, such as light therapy machines or heated tools.

The other units listed measure different electrical properties: ohms measure resistance, volts measure electric potential, and amperes measure electric current. Each of these units plays an essential role in the context of electricity but does not directly measure power like the watt does.