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प्रश्न
A battery lights a bulb. Describe the energy changes involved in the process.
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उत्तर
- When a bulb is connected to a battery, then the chemical energy of the battery is transferred into electrical energy.
- When the bulb receives this electrical energy, then it converts it into light and heat energy.
- Hence, the transformation of energy in the given situation can be shown as:
Chemical Energy → Electrical Energy → Light Energy + Heat Energy
संबंधित प्रश्न
What is power?
What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.
Find the energy in joules consumed in 10 hours by four devices of power 500 W each.
A body of mass 100 kg is lifted up by 10 m. Find :
(i) the amount of work done
(ii) potential energy of the body at that height (value of g = 10 m/s2)
How much is the mass of a man if he has to do 2500 joules of work in climbing a tree 5 m tall? (g = 10 m s−2)
Fill in the blank with suitable word :
Power is the rate of doing ___________.
A car of weight 20000 N climbs up a hill at a steady speed of 8 m/s, gaining a height of 120 m is 100 s. Calculate : work done by the car.
Define power. Give the SI unit of power.
An electric motor raises a load of 0.2 kg, at a constant speed, through a vertical distance of 3.0 m in 2 s. If the acceleration of free fall is 10 m/s2, the power in W developed by the motor in raising the load is :
How is the power related to the speed at which a body can be lifted? How many kilograms will a man working at the power of 100 W, be able to lift at a constant speed of 1 m s–1 vertically? (g = 10 m s–2)
