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प्रश्न
How much energy does a 100 W electric bulb transfer in 1 minute?
पर्याय
100 J
600 J
3600 J
6000 J
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उत्तर
Power, (P) = 100 W
Time duration, (t) = 60 s
Now, we can calculate the electrical energy consumed as,
Energy consumed = (Power) (Time)
So,
Energy consumed
= (100) (60) J
= 6000 J
So, the energy consumed is 6000 J.
Therefore, the answer is, (d) 6000 J.
संबंधित प्रश्न
State the condition under which the mechanical energy is conserved.
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- The body is at the top.
- the body has fallen a distance x.
- the body has reached the ground.
A stone of mass 500 g is thrown vertically upwards with a velocity of 15 m/s. Calculate:
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- the kinetic energy on reaching the ground, and
- the total energy at its half-way point.
A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5 m above the ground. Taking g = 10 m s−2, calculate:
- the potential energy possessed by the ball when it is initially at rest.
- the kinetic energy of the ball just before it hits the ground?
State whether the object possess kinetic energy, potential energy, or both :
A flying aeroplane _______________.
What kind of energy is possessed by the following?
A running car ____________
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What is his potential energy at the highest point? (g = 10 m/s2)
Give two examples where a body possesses both, kinetic energy as well as potential energy.
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Name the device or machine which convert :
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Name the device or machine which convert :
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Name the device or machine which convert :
light energy into heat energy.
Fill in the blank with suitable word:
The electricity meter installed in our homes measure electrical energy in the units of ___________.
How much electrical energy in joules does a 100 watt lamp consume : in 1 second?
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What is the meaning of the symbol kWh? What quantity does it represent?
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Which of the following energy change involves frictional force?
An automobile engine propels a 1000 kg car (A) along a levelled road at a speed of 36 km h–1. Find the power if the opposing frictional force is 100 N. Now, suppose after travelling a distance of 200 m, this car collides with another stationary car (B) of the same mass and comes to rest. Let its engine also stop at the same time. Now the car (B) starts moving on the same level road without getting its engine started. Find the speed of the car (B) just after the collision.
