Board of Trade Unit
The
Board of Trade Unit or
B.O.T.U. 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.