Question

A certain household has consumed $250$ units of energy during a month. How much energy is this in joules?

• A. $9\times {10}^{10}J$
• B. $9\times {10}^{8}J$
• C. $9\times {10}^{9}J$
• D. $9\times {10}^{-8}J$

Answer 1

Answer: (B)

$9\times {10}^{8}J$

$1$ unit of energy $=1kWh$

$1kwh=3.6\times {10}^{6}J$

Thus $250$ unit$=250\times 3.6\times {10}^{6}J$$=9\times {10}^{8}J$