Switch off the power, and disconnect the freezer from the power supply. Make sure the power cannot be reconnected to the appliance while you are working on it.
Access the rear of the freezer, and look for a cylindrical object connected to thin pipes. This is the compressor; it may look similar to a pressurized gas cylinder. Locate the manufacturer's plaque attached to the compressor, and read the "Maximum wattage" information.
Substitute the maximum wattage and the appliance voltage into Ohm's Law to determine the starting current. Ohm's Law, often expressed as I = P/V, where I is the current, P is the power in watts and V is the voltage, states that the current equals the wattage divided by the voltage. For example, a 720-watt compressor running on 120 volts draws a starting current of 6 amps: 720/120 = 6.
Things You Will Need
- The technical data section of the appliance manual may list the maximum compressor wattage. It may be listed for the compressor or as the appliance maximum wattage.
- The compressor "maximum wattage" is the wattage drawn at start-up and is the value used to determine the start-up current. The normal running wattage is considerably lower than the start-up value.