Discussion
One kWh is equal to -
Answer: A
One kWh is equal to about 860 kcal.
One kilowatt-hour is 1000 W for 3600 s, and one kilocalorie is about 4186 J.
\[ \begin{aligned} 1\ \text{kWh} &= 3.6 \times 10^{6}\ \text{J} \\ &= \frac{3.6 \times 10^{6}}{4186} \approx 860\ \text{kcal} \end{aligned} \]
This conversion is used constantly in heating problems, such as finding the energy needed to boil water. 765, 535 and 440 kcal do not correspond to any standard conversion.
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