State the advantages and disadvantages of using solar cells.

1. They do not have moving parts and require no maintenance.

2. They can be used even in remote and inaccessible areas.

1. They are very expensive, as they require a special grade of silicon or silver wire.

2. They are less efficient, as they can convert only about 25% of the light falling on them into electricity.

3. They cannot work during the night time and can't even work in the day time when the sky is cloudy.