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There is also the "British Thermal Unit", normally abbreviated BTU, which is mainly used for things like specifying the amount of heat put out by furnaces. There are various definitions of the BTU, which range from about 1,054 to 1,060 J according to the other wiki. To make things even more confusing to outsiders, American Engineers measure cooling in tons (12,000 BTU/hr, equivalent to 1 ton of ice per day or ~3516.85 W) and heating in MBH (one thousand BTU/hr or ~293.07 W; the M is the Roman numeral for 1000, not the expected one million); both of those units are also technically measures of ''power'', not energy, but the BTU is an odd enough bird that it's better to keep everything together.
'''Power:''' The common unit of power in the United States is the horsepower. There are five different types of horsepower, just to be even more confusing. The most common is Mechanical horsepower (more often called brake horsepower, from the method used to derive it) which is used by auto manufacturers to tell [[Viewers
All that said, you're unlikely to see horsepower used outside of the automotive (and the propeller aviation and helicopter aviation) realm or certain kinds of electrical motors. As noted above, all electrical appliances in the US specify their rated consumption in watts (or the equivalent in volts and amperes), especially light bulbs and pretty much anything with a heating element in it. Ads for things electronic also tend to boast about how many watts they can output, especially high-power audio amplifiers and, sometimes, even the radio stations themselves.
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