Transformer to change the voltage value acting AC voltage into the appropriate usage. You can change has increased and decreased, usually to reduce the voltage to be used in electronic circuits.
Transformer will convert the voltage into AC voltage suitable for the application. The change has increased and decreased. This typically reduces the voltage for use in electronic circuits.
Alternating current voltage transformer is also changed into voltage suitable for use. The change increase and decrease. This is usually the pressure for use in electronic circuits.