POWER PLUG FOR MONITORING APPLIANCE PERFORMANCE

A power plug for coupling an electrical appliance to an electrical power supply, comprising: a current sensor, configured to measure current supplied through the plug to the electrical appliance; a voltage sensor, configured to measure voltage supplied through the plug to the electrical appliance; a processor configured to determine power consumption data from data relating to the current and voltage measurements made by the current and voltage sensors and monitor the performance of the electrical appliance using the power consumption data; and a transmitter, configured to transmit information relating to the performance of the electrical appliance.