Advertisements
Advertisements
प्रश्न
Write the energy transformations which take place in an electric bulb (or electric lamp).
Advertisements
उत्तर
An electric bulb converts electrical energy into light energy. Electrical energy causes the filament in the bulb to become white-hot and give out light. So, in an electric bulb, the electrical energy is first converted into heat energy and then to light energy. This energy transformation can be written as,
Electrical energy → Heat energy → Light
संबंधित प्रश्न
In what way does the temperature of water at the bottom of a waterfall differ from the temperature at the top? Explain the reason.
State the condition under which the mechanical energy is conserved.
State whether the object possess kinetic energy, potential energy, or both :
A man climbing a hill _____________.
What kind of energy is possessed by the following?
A running car ____________
What kind of energy is possessed by the following?
A stretched rubber band _____________
What type of energy is possessed : by the piece of stone which is thrown away on releasing the stretched rubber strings of catapult?
What type of energy is possessed : by the stretched rubber strings of a catapult?
What are the various forms of energy?
Water stored in a dam possesses ______.
Name the device which converts electrical energy into mechanical energy.
Name the device or machine which convert :
Chemical energy into kinetic energy (or mechanical energy).
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?
Five electric fans of 120 watts each are used for 4 hours. Calculate the electrical energy consumed in kilowatt-hours.
How much electric energy in kWh is consumed by an electrical appliance of 1000 watts when it is switched on for 60 minutes?
When an object falls freely towards the earth, then its total energy :
An object is falling freely from a height x. After it has fallen a height `pi/2` , it will possess :
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g = 10 m s–2)
