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Answer :
1 unit of energy is up to one B.T.U. (kWh).
1 unit = one kWh
\( 1 \ kWh \ = \ 3.6 x 10^6 \ J \)
\(\therefore \) 250 units of energy
= \( 250 \ × \ 3.6 × 10^6 \)
\( Energy \ = \ 9 × 10^8 \ J \) .