One ton of A/C (or refrigeration) = 12,000 btu. Because an A/C is a heat pump it need not generate that amount of enerjy. It only need to transfer it. Air conditioners are rated for enerjy efficiency: EER or SEER An EER of "10" mean 10btu per Watt of electrical input. At 120VAC, 10 Ampere = 1,200 Watts At EER 10, 1,200 Watt = 12,000 btu or 1 ton EER exceeding 16 are not uncommon.
Every air conditioner i rated by Voltage, current, and power (Watts). Most also specify minimum circuit ampacity. Attempt to "calculate" current requirements from btu rating are inadvisable.
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