NCERT Exemplar XIX — task. Science CBSE, Class 9.

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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. \(2000\ tonnes\) of water falls from it in a minute. Calculate the equivalent power if all this energy can be p utilized? (\(g\ =\ 10\ m s^{-2}\))

Power is defined as .

is the unit of power.

is the unit of energy.

The formula to calculate the Potential energy (\(E_{p}\)) is,

\(E_{p}\ =\ m \times g \times h\)
\(E_{p}\ =\ m \times \frac{g}{h}\)
\(E_{p}\ =\ m \times g\)
\(E_{p}\ =\ m \times g\ +\ h\)

The formula to calculate the Power (\(P\)) is,

\(P\ =\ \frac{E_{p}}{g}\)
\(P\ =\ E_{p} \times g\)
\(P\ =\ E_{p} \times t\)
\(P\ =\ \frac{E_{p}}{t}\)

Energy possessed by water \(=\) \(\times 10^8\ J\)

Power \(=\) \(\times 10^7\ W\)

(Note: Enter your answer in \(2\) decimal digits)

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