The only way to find out is to measure your own fridge. Some have features like defrosting that use a lot of energy. A DC clampmeter makes it easy but an ordinary multimeter can measure fridge current on a 10 amp range very accurately if you can get the current to flow through it.
Energy is the natural quantity to think about. The common unit is the watt*hour.
Power is how fast energy is being used - unit: watt.
Power = energy per hour.
Current is most easily measured but has to be multiplied by voltage to get power. One amp from a 12 volt source is 1 * 12 = 12 watts. In an hour that amounts to 12 watt*hours of energy.