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For each of the following situations, identify the energy transformation that takes place: (i) a truck moving uphill, (ii) unwinding of a watch spring, (iii) photosynthesis in green leaves, (iv) water flowing from a dam, (v) burning of a matchstick, (vi) explosion of a fire cracker, (vii) speaking into a microphone, (viii) a glowing electric bulb, and (ix) a solar panel.
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(i) Chemical (fuel) → kinetic + gravitational potential energy.
(ii) Elastic potential → kinetic (mechanical) energy.
(iii) Light (solar) → chemical energy.
(iv) Gravitational potential → kinetic energy.
(v) Chemical → heat + light energy.
(vi) Chemical → heat + light + sound + kinetic energy.
(vii) Sound → electrical energy.
(viii) Electrical → light + heat energy.
(ix) Light (solar) → electrical energy.
| Situation | Energy transformation |
|---|---|
| (i) a truck moving uphill | chemical (fuel) → kinetic + potential (+ heat) |
| (ii) unwinding of a watch spring | elastic potential → kinetic |
| (iii) photosynthesis in green leaves | light (solar) → chemical |
| (iv) water flowing from a dam | potential → kinetic |
| (v) burning of a matchstick | chemical → heat + light |
| (vi) explosion of a fire cracker | chemical → heat + light + sound + kinetic |
| (vii) speaking into a microphone | sound → electrical |
| (viii) a glowing electric bulb | electrical → light + heat |
| (ix) a solar panel | light (solar) → electrical |
