The refrigerator uses around 20 amps and a circuit of 125 volts. A smaller refrigerator needs less power than a larger one. Keep in mind that a large refrigerator needs a ground wire for safety.
To save money on electricity, you need to clean the fridge coils. These are energy coils, and they need to be checked every six months. To use your fridge efficiently, you should never fill it, because this can stop the flow of cold air. Another good tip is to cool the food at room temperature before placing it in the refrigerator. The best temperature setting is medium cool.