Question

9. 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 utilized?​

Answer 1

Power is the rate of doing work. Kilowatt is the unit of power and kilowatt hour is the unit of energy.

hh=20 m and mass=2000×10

3

kg=2×10

6

kg

Power=

t

mgh

=

60

2×10

5

×10×20

W

=

6

4

×10

7

W=

3

2

×10

7

W

Answer 2

Answer:

1. In physics, power is the amount of energy transferred or converted per unit time. In the International System of Units, the unit of power is the watt, equal to one joule per second. In older works, power is sometimes called activity. Power is a scalar quantity.

2. A kilowatt-hour (kWh) and a kilowatt (kW) may sound like the same thing, but they're not quite tomato-tomahto. While both are interrelated units of measurement, the important difference between kWh and kW is that a kWh reflects the total amount of electricity used, whereas a kW reflects the rate of electricity usage.

3.Given,

Height of fall h=20m

Mass of water m=2000tonnes=2000000kg

Time t=1min=60s

We know,

Power=work done per unit time.

Work done=mgh

=2000000×10×20

=400000000

So,the power=

60

400000000

=6.67×10

6

W

Explanation:

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