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The Board of Trade Unit or B.O.T.U. is a non-SI unit of electrical energy, defined by a former department of the UK government. It is the same as the kilowatt-hour (kWh), which is the amount of energy consumed by a one kilowatt appliance in one hour.
One B.O.T.U. or kWh = 3.6 × 106 joule.
The B.O.T.U. should not be confused with the British thermal unit or BTU, which is a much smaller quantity of thermal energy.
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