how to test a transformer is working?

To test if a transformer is working, you can perform a few key checks. First, measure the input voltage with a multimeter to ensure it matches the transformer’s rated voltage. Next, check the output voltage on the secondary side to confirm it aligns with specifications. Additionally, inspect for any unusual sounds, overheating, or physical damage. Finally, you can perform a continuity test on the windings to ensure there are no breaks.