- Photovoltaic cells can be used in handheld calculators
- Photovoltaic cells convert light energy into electricity / electrical energy
- So, photovoltaic cells are used in handheld calculators to convert light energy into electricity

Therefore, photovoltaic cells are used in handheld calculators to convert light energy into electricity
Question: A device that converts light energy into electricity used in many handheld calculators is a
Context: - Photovoltaic cells can be used in handheld calculators 
- Photovoltaic cells convert light energy into electricity / electrical energy