how much power does a 110v transformer use?

The power consumption of a 110V transformer depends on its load and efficiency. The transformer’s power rating, typically measured in volt-amperes (VA), indicates the maximum load it can handle. To calculate the actual power used, multiply the voltage (110V) by the current (in amperes) drawn by the connected load. Additionally, consider the transformer’s efficiency, which typically ranges from 80% to 95%, as this affects the actual power consumed from the source.