Question

1. if sunlight is free, why is electricity from solar cells expensive?

Explanation:

Solar - cell production involves high - cost materials like silicon, complex manufacturing processes for high - efficiency cells, and significant research and development expenses. Also, initial installation costs are high due to the need for inverters, mounting systems, and wiring.

Answer:

The electricity from solar cells is expensive mainly due to high - cost materials, complex manufacturing, R & D expenses, and high initial installation costs.