what is the purpose of a step up transfomer is to
The purpose of a step up transformer is to take a voltage supply of one value and increase it to a voltage supply of a higher value. step-up transformer is a transformer that receives its voltage lower than its output voltage (it 'steps-up ' the voltage). While a step-down transformer is a transformer tha â¦ t receives the voltage higher than the output voltage, thus, stepping down the voltage.