How to measure Power Consumption of your Home
A household appliances’ wattage can be determined by:
a) Checking the appliance’s rear or power supply for the figures.
b) Referring to the product manual.
c) Using a watt meter to measure the wattage.
d) Checking similar appliances for the wattage.
A power supply tends to show amps as output current instead of showing the wattage of the device. A power supply with an output voltage display can be used to calculate the wattage by multiplying current (amps) with voltage.