Advertisements
Advertisements
Question
Write the energy transformations which take place in an electric bulb (or electric lamp).
Solution
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
APPEARS IN
RELATED QUESTIONS
Show that the sum of kinetic energy and potential energy (i.e., total mechanical energy) is always conserved in the case of a freely falling body under gravity (with air resistance neglected) from a height h by finding it when
- The body is at the top.
- the body has fallen a distance x.
- the body has reached the ground.
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 stone kept on roof-top _______________
Name the device or machine which convert :
Chemical energy into electrical energy.
Name the device or machine which convert :
light energy into heat energy.
Fill in the blanks with suitable words:
When a ball is thrown upwards, ___________ energy is transformed into ___________ energy.
Name the energy transfers which occur when :
an electric ball rings
Name the energy transfers which occur when : a torch is on
When an object falls freely towards the earth, then its total energy :
In the case of negative work, the angle between the force and displacement is
