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11. Work and Energy
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Q1 of 33 Page 156

What is Power?

Power is defined as energy consumed or work done per unit time.

Power = Work done / time


Or,


Energy consumed / time


Its SI unit is watts or joules/ sec


More from this chapter

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2

Write an expression for the kinetic energy of an object.

3

The kinetic energy of an object of mass ‘m’ moving with a velocity of 5 m s-1 is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times?

2

Define 1 watt of power.

3

A lamp consumes 1000 J of electrical energy in 10 s. What is its power?

Questions · 33
11. Work and Energy
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