Board of Trade Unit
The Board of Trade Unit
is a non-metric
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.