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dukg08
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Homework Statement
(a) The wind-up radio is a wonderful example of the process of energy transformation from one type to another. The radio is operated as follows:
(i)
The user turns a handle that winds a metal spring onto a spool.
(ii)
The metal spring then unwinds slowly, through a number of gears, rapidly turning the spindle of a small electrical generator.
(iii) The electrical generator feeds a rechargeable battery.
(iv)
When the radio is turned on, it is powered from the battery.
(v)
Sound is produced by the vibrating diaphragm in the radio’s loudspeaker.
Based on the information in (i)–(v), list the energy transfers and conversions which take place in the process described above, from the user initially turning the handle through to the sound being produced by the radio. You should give your answer as a series of points and in each point you should clearly identify the stage you are describing and the energy transfers and/or conversions that are taking place. We expect you will be able to answer part (a) in around 200 words.
Homework Equations
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The Attempt at a Solution
(i)
The user turns a handle that winds a metal spring onto a spool. - chemical energy in the body to kinetic energy in turning the handle to strain potential energy
(ii)
The metal spring then unwinds slowly, through a number of gears, rapidly turning the spindle of a small electrical generator. not sure what energy/conversion this all has except it's some sort of movement - mechanical energy
(iii) The electrical generator feeds a rechargeable battery. mechanical energy into stored electrical energy
(iv)
When the radio is turned on, it is powered from the battery. kinetic energy to electrical energy
(v)
Sound is produced by the vibrating diaphragm in the radio’s loudspeaker. electrical energy into something into sound energy
I'm not totally sure I'm on the right track with this. Obviously I will re-write this.
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