Procedure
The figure below shows how to connect the elements to the measurements.
What is done is to measure the alternating voltage on a resistor of known value. Being too low, it does not affect the power of the device. Simply multiply the value in volts measured by the power grid voltage to obtain the consumption. For example, 1 Volt over 1 ohm means 1 A and in the 110 V network this represents 110 W. 1 volt over 1 ohm in 220 V represents 2.0 A and this means 220 W. We proceed as follows:
We put the multimeter on the lowest alternating voltage scale
We connect it to the resistor as indicated
We turn on the device under test
We multiply the voltage measured by the power grid voltage to have the power consumed.
