List any four areas where solar cells are being used as a source of energy.
Solar cells are the renewable source of energy which converts the solar energy (energy from the sun) into electricity. A few areas in which solar cells are used are as follows:
• Solar cells are used in traffic lights and street lights.
• Nowadays solar panels are also used in trains like metros.
• Food can be cooked using solar cookers.
• Some calculators also have solar cells embedded in them.