Of those, it’s certainly the air conditioner.
Nearly every appliance has a plate on it somewhere that tells you how much power they use in watts and or amps.
Simplified, Watts = amps x volts and Amps = watts / volts if you need to convert. In the US, volts is nearly always 120. For some very large appliances, it is sometimes 240. This will usually be electric heat, central a/c units (and some window units), electric ranges, dryers, welders, hot tubs, etc.
Larger numbers for either watts or amps = more power. For example 1000 watts is more power than 500 watts.
Other than reading the plate on the appliance, it is possible to actually measure the amount of power a device is drawing. Devices that plug in in between the appliance and the receptacle, devices that are connected inside your electrical panel, or a basic multimeter could all be used to accurately measure the power being used.
As I did in the very first sentence, generalizations can also be used to infer which appliance draws the most power – this is based simply on knowledge of what these appliances use on average.
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