Question

1 Kilo watt hour is equal to ____ eV

• A. ${2.25\times 10}^{25}$
• B. ${3.6\times 10}^{18}$
• C. ${1.6\times 10}^{10}$
• D. ${2.25\times 10}^{20}$

Answer 1

The correct option is A ${2.25\times 10}^{25}$

1 killo watt hour $=1\times {10}^3\times 60\times 60$ Joules
$=3.6\times {10}^6$ Joules
1 ev $=1.6\times {10}^{-19}$ Joules
$\Rightarrow 1kwHr=3.6\times {10}^6$ Joules
$=3.6\times {10}^6\times \frac{1}{1.6\times {10}^{-19}}$
$=2.25\times {10}^{25}$ eV