One calorie heat energy is equal to the electrical energy of

1
\( {10^{3} \over 86}\) kWh
2
\( {10^{-4} \over 860}\) kWh
3
\( {10^{-3} \over 8.6}\) kWh
4
\( {10^{-3} \over 860}\) kWh

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