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What is power? How do you differentiate ’ kilowatt from kilowatt hour? The Jog Falls in Karnataka state are nearly $20\ m$ high. $2000\ tonns$ of water falls from it in a minute. Calculate the equivalent power if all this energy can be p utilized? $(g=10\ ms^{-2})$
Power: The rate of work done or energy transfer with respect to time is said to be the power. It is denoted by $P$.
Power $P=\frac{work\ done(W)}{time(t)}$
SI unit of power is Joule/second or Watt.
Kilowatt is the unit of power. In short, it is written $KW$.
$1\ Kilowatt=1000\ Watt$
While Kilowatt-hour is a commercial unit of energy.
$1\ Kilowatt-hour=3.6\times10^6\ Joule$
Mass of water $=2000\ tonns=2000\times10^3\ kg=2\times10^6\ kg$
Height $h=20\ m$
Therefore, the energy possessed by water at the given height,
$E=mgh$
$=2\times10^6\ kg\times 10\ ms^{-2}\times20\ m$
$=4\times10^8\ Joule$
Power generated $P=\frac{energy}{time}$
$=\frac{4\times10^8\ Joule}{60\ second}$
$=\frac{2}{3}\times 10^7\ W$
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