In a solar-powered calculator, which sequence best represents the conversion of energy forms from sunlight to calculation display?
Light energy to electrical energy to mechanical energy
A solar-powered calculator works from sunlight. Its solar cell (photovoltaic cell) absorbs light and converts light energy directly into electrical energy, and this electric current then runs the circuit that produces the calculation display.
So the sequence must begin with light energy and then change to electrical energy, which is the essential conversion in the device. The electrical energy is finally used to change the state of the display segments so that the result appears, and among the given sequences only the one that starts with light energy and passes to electrical energy captures this essential conversion. Its last step is only loosely worded, since the display has no moving parts and its segments simply change state, but no other sequence begins from light.
The other sequences cannot be correct because none of them starts from sunlight: one starts with thermal energy and passes through sound, one starts with chemical energy as in a cell or battery, and one starts with electrical energy, leaving out the conversion of light that powers the calculator.
Hence, Light energy to electrical energy to mechanical energy.
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