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A certain household has consumed $250\ units$ of energy during a month. How much energy is this in joules?
Given: A certain household has consumed $250\ units$ of energy during a month
To do: To calculate this consumed energy in joule.
Solution:
Energy consumed by the household $=250\ units$
$=250\ kWh$
$=250\times10^3\ W\times1\ h$
$=250\times10^3\ W\times60\times60\ seconds$
$=9,00,000\times10^3$
$=90,00,00,000$
$=9\times10^8\ Joule$
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