Question

1.a)Name one element of which a solar cells is made.
b)State two advantages of using solar cells to produce electricity.
c) State the principal of the working of solar water heater. ​

Answer 1

1a) Silicon

b) i) installation may be costly but the cost of maintenance is cheap

ii) Eco friendly.

c) Green house effect

Answer 2

a) crystalline silicon

b)* it has the least negative imapact on the environment

* it is the renewable source of energy

c) it works on the principle of green house