In this activity, we will understand that some energy remains unused or may be wasted in the process of converting energy into work.
NIOS Class 10 Science and Technology (212)
Project File
This activity is based on the NIOS Class 10 science
and technology (212) Chapter 13- Work and Energy, Module 4.
Energy Conversion Activity
Aim
To demonstrate that some energy is always unused or wasted
during the conversion of energy into work
Materials Required
1. Two
balloons
Two people can perform this activity. Here, Alok and
Kapil are performing this activity.
Procedure
Alok inflates his balloon by blowing air into it with part
of its opening pressed through a narrow gap, while Kapil inflates his balloon by
blowing air through the entire opening.
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Observation
We observe that Alok makes more effort, and his balloon
inflates slowly and does not become big, but Kapil’s balloon inflates faster and
becomes large with less effort.
Explanation
In this activity, both boys used their muscular
energy to blow the balloons. Alok’s energy is wasted in overcoming the resistance
of the narrow opening, so less energy is available for inflating the balloon.
But Kapil’s energy is converted into work
for
inflating
the balloon.
In both cases, some energy is lost as
heat, sound, and
air
resistance.
Conclusion
This
activity shows that 100 % conversion of energy into
work
is not possible. Some energy is always wasted or
remains
unused.
Frequently Asked Questions
1. What happens to wasted energy during
conversion into work?
Answer – The energy is lost as heat or sound, or in
overcoming air resistance.
2. Is
100 % conversion of energy into work possible?
Answer – No, it is not possible to convert 100 %
energy into work.
3. Why
does air blown from a phukni increase fire in chulhas?
Answer – Narrow opening of phukni increases the speed
of air and supplies more oxygen to the fire.
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