Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

EASY

Earn 100

The work done per unit is called power.

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Important Questions on Effect of Energy: Work, Power and Energy

MEDIUM

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

Derive a relationship between SI and CGS units of work.

EASY

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

A crane

' A'

lifts a heavy load in

5 seconds

, whereas another crane

' B'

does the same work in

2 seconds

. Compare the power of crane

' A'

to that of crane

' B'

.

EASY

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

State and define the SI unit of power.

MEDIUM

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

How much electrical energy in joules does a

100 w a t t

lamp consume in

1 second

?

MEDIUM

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

A woman pulls a bucket of water of mass

5 kg

from a well which is

10 m

deep in

10 s

. Calculate the power used by her. (taking

g = 10 \frac{m}{s^{2}}

)

EASY

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

Power is a scalar quantity. Give a reason.

EASY

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

How much energy is used for boiling water in a

2 kW

kettle for

10 minutes

? Calculate it in watt-hour.

EASY

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

The power output of an engine is

3 k W

. How much work does the engine do in

20 s

?

EASY

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

Name the quantity whose unit is

a. kilowatt

b. kilowatt-hour

EASY

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

A water pump raises

50 kg

of water through a height of

25 m

in

5 s

. Calculate the power which the pump supplies. (take

g = 10 \frac{m}{s^{2}}

)

EASY

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

Calculate the power of a pump which can lift

100 kg

of water stored in a water tank at a height of

19 m in 25 s .

(take

g = 10 \frac{m}{s^{2}}

)

MEDIUM

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

A boy of mass

45 kg

climbs up

20

steps in

20

seconds. If each step is

25 cm

high, calculate the power used in climbing. (take

g = 10 \frac{m}{s^{2}}

)

EASY

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

A boy of mass

50 kg

runs up a staircase of

60

steps in

9 s

. If the height of each is

15 cm

, find his power. (take

g = 10 \frac{m}{s^{2}}

)

EASY

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

An electric heater uses

600 kJ

of electrical energy in

5 minutes

. Calculate its power rating.

EASY

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

Name the two factors on which power depends.

EASY

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

Define power in terms of energy.

EASY

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

Power is a

EASY

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

1 hp

is equivalent to

EASY

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

A man carrying a bag of mass

25 kg

climbs up to a height of

10 m

in

50 s

. Calculate the power delivered by him to the bag. (take

g = 10 m / s^{2}

)

MEDIUM

Physical Science>Physics>Effect of Energy: Work, Power and Energy>Power

An electric oven of $3 kW$ is connected to the mains of $220 V$ . Calculate:

The cost of electrical energy consumed if the cost per unit is $Rs . 6.50$ and if the oven is switched on for an hour.