Both kinetic energy and potential energy

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A water pump lifts water from a level $10 m$ below the ground. The water is pumped at the rate of $30 kg / \min$ with negligible velocity. Calculate the minimum power the pump should have to do this work.

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Important Questions on Work, Energy and Power

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An object of mass

15 kg

is moving with uniform velocity of

4 m / s

. What is the kinetic energy possessed by the object?

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Consider two circuits:
(i) A: in which N identical bulbs are connected in series across a battery of emf E.
(ii) B: in which N bulbs identical to those in A are connected in parallel across similar battery of emf E.

P_{A}

: Power dissipating in each bulb in A.

P_{B}

: Power dissipating in each bulb in B.

P_{AT}

: Total power delivered by battery in circuit A.

P_{B T}

: Total power delivered by battery in circuit B.

EASY

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A force of

40 N

acts on a body, and body moves through a distance of

2

metre at an angle of

45 °

in the direction of the force. The work done by the force is

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Which formula is not correct for

R

(R =

resistance)

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Which of the following terms does not represent electrical power in a circuit ?

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Figure shows three electrical appliances connected to a

220 V

ac mains. What is the amperage (current rating) of the fuse that should be used in the circuit?
Question Image

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An electric bulb is connected to a

220 V

generator. The current is

500 mA

. What is the power of the bulb?

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A boy of mass

50 kg

runs a stair case of

45

steps in

9 \sec

. If the height of each steps is

15 cm

, find his power. (Take

g = 10 {ms}^{- 2}

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Which of the following term does not represent electric power

(P)

in electric circuit ?

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If the current through a resistor is increased by 50%, the increase in power dissipated will be (assume the temperature remains constant)

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A household consumes

1 kwh

of energy per day. This energy in joules is:

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The practical unit of electrical energy

1 kWh

means

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Electrical power is given by

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One kilowatt hour

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An electric bulb has rating of

30 W, 12 V

. The maximum current that can pass through it will be :

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An Electric motor takes

37.5

Amp to start. Then its efficiency is_____. (The voltage of the domestic power supply is

200 V

)

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Flying birds has

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1 kWh =

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Commercial unit of electrical energy one kilowatt hr.

(1 kWh)

is equivalent to:

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A pump on the ground floor of a building can pump up water to fill the tank of

30 m^{3}

15

min. If the tank is

40 m

above the ground, and the efficiency of the pump is

30 %,

the power consumed by the pump is

(g = 10 m / s^{2})

A water pump lifts water from a level 10 m below the ground. The water is pumped at the rate of30 kg/min with negligible velocity. Calculate the minimum power the pump should have to do this work.

Important Questions on Work, Energy and Power

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A water pump lifts water from a level $10 m$ below the ground. The water is pumped at the rate of $30 kg / \min$ with negligible velocity. Calculate the minimum power the pump should have to do this work.